DEEn Dictionary De - En
DeEs De - Es
DePt De - Pt
 Vocabulary trainer

Spec. subjects Grammar Abbreviations Random search Preferences
Search in Sprachauswahl
Search for:
Mini search box
 

   varied Lorikeet
         n 1: lorikeet with a colorful coat [syn: {varied Lorikeet},
               {Glossopsitta versicolor}]

English Dictionary: virtual(a) by the DICT Development Group
From WordNet (r) 3.0 (2006) [wn]:
varietal
n
  1. a wine made principally from one grape and carrying the name of that grape
    Synonym(s): varietal, varietal wine
    Antonym(s): generic, generic wine
From WordNet (r) 3.0 (2006) [wn]:
varietal wine
n
  1. a wine made principally from one grape and carrying the name of that grape
    Synonym(s): varietal, varietal wine
    Antonym(s): generic, generic wine
From WordNet (r) 3.0 (2006) [wn]:
verdolagas
n
  1. weedy trailing mat-forming herb with bright yellow flowers cultivated for its edible mildly acid leaves eaten raw or cooked especially in Indian and Greek and Middle Eastern cuisine; cosmopolitan
    Synonym(s): common purslane, pussley, pussly, verdolagas, Portulaca oleracea
From WordNet (r) 3.0 (2006) [wn]:
virtual
adj
  1. being actually such in almost every respect; "a practical failure"; "the once elegant temple lay in virtual ruin"
    Synonym(s): virtual(a), practical(a)
  2. existing in essence or effect though not in actual fact; "a virtual dependence on charity"; "a virtual revolution"; "virtual reality"
From WordNet (r) 3.0 (2006) [wn]:
virtual image
n
  1. a reflected optical image (as seen in a plane mirror)
From WordNet (r) 3.0 (2006) [wn]:
virtual memory
n
  1. (computer science) memory created by using the hard disk to simulate additional random-access memory; the addressable storage space available to the user of a computer system in which virtual addresses are mapped into real addresses
    Synonym(s): virtual memory, virtual storage
From WordNet (r) 3.0 (2006) [wn]:
virtual reality
n
  1. a hypothetical three-dimensional visual world created by a computer; user wears special goggles and fiber optic gloves etc., and can enter and move about in this world and interact with objects as if inside it
From WordNet (r) 3.0 (2006) [wn]:
virtual storage
n
  1. (computer science) memory created by using the hard disk to simulate additional random-access memory; the addressable storage space available to the user of a computer system in which virtual addresses are mapped into real addresses
    Synonym(s): virtual memory, virtual storage
From WordNet (r) 3.0 (2006) [wn]:
virtually
adv
  1. in essence or effect but not in fact; "the strike virtually paralyzed the city"; "I'm virtually broke"
  2. (of actions or states) slightly short of or not quite accomplished; all but; "the job is (just) about done"; "the baby was almost asleep when the alarm sounded"; "we're almost finished"; "the car all but ran her down"; "he nearly fainted"; "talked for nigh onto 2 hours"; "the recording is well-nigh perfect"; "virtually all the parties signed the contract"; "I was near exhausted by the run"; "most everyone agrees"
    Synonym(s): about, almost, most, nearly, near, nigh, virtually, well-nigh
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Weroole \We*roo"le\, n. (Zo[94]l.)
      An Australian lorikeet ({Ptilosclera versicolor}) noted for
      the variety of its colors; -- called also {varied lorikeet}.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Varied \Va"ried\, a.
      Changed; altered; various; diversified; as, a varied
      experience; varied interests; varied scenery. --
      {Va"ried*ly}, adv.
  
               The varied fields of science, ever new.   --Cowper.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Varietal \Va*ri"e*tal\, a.
      Of or pertaining to a variety; characterizing a variety;
      constituting a variety, in distinction from an individual or
      species.
  
               Perplexed in determining what differences to consider
               as specific, and what as varietal.         --Darwin.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Vertilinear \Ver`ti*lin"e*ar\, a. [Vertical + linear.]
      Straight; rectilinear. [R.]

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Virtual \Vir"tu*al\ (?; 135), a. [Cf. F. virtuel. See {Virtue}.]
      1. Having the power of acting or of invisible efficacy
            without the agency of the material or sensible part;
            potential; energizing.
  
                     Heat and cold have a virtual transition, without
                     communication of substance.               --Bacon.
  
                     Every kind that lives, Fomented by his virtual
                     power, and warmed.                              --Milton.
  
      2. Being in essence or effect, not in fact; as, the virtual
            presence of a man in his agent or substitute.
  
                     A thing has a virtual existence when it has all the
                     conditions necessary to its actual existence.
                                                                              --Fleming.
  
                     To mask by slight differences in the manners a
                     virtual identity in the substance.      --De Quincey.
  
      {Principle of virtual velocities} (Mech.), the law that when
            several forces are in equilibrium, the algebraic sum of
            their virtual moments is equal to zero.
  
      {Virtual focus} (Opt.), the point from which rays, having
            been rendered divergent by reflection of refraction,
            appear to issue; the point at which converging rays would
            meet if not reflected or refracted before they reach it.
           
  
      {Virtual image}. (Optics) See under {Image}.
  
      {Virtual moment} (of a force) (Mech.), the product of the
            intensity of the force multiplied by the virtual velocity
            of its point of application; -- sometimes called {virtual
            work}.
  
      {Virtual velocity} (Mech.), a minute hypothetical
            displacement, assumed in analysis to facilitate the
            investigation of statical problems. With respect to any
            given force of a number of forces holding a material
            system in equilibrium, it is the projection, upon the
            direction of the force, of a line joining its point of
            application with a new position of that point indefinitely
            near to the first, to which the point is conceived to have
            been moved, without disturbing the equilibrium of the
            system, or the connections of its parts with each other.
            Strictly speaking, it is not a velocity but a length.
  
      {Virtual work}. (Mech.) See {Virtual moment}, above.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Virtual \Vir"tu*al\ (?; 135), a. [Cf. F. virtuel. See {Virtue}.]
      1. Having the power of acting or of invisible efficacy
            without the agency of the material or sensible part;
            potential; energizing.
  
                     Heat and cold have a virtual transition, without
                     communication of substance.               --Bacon.
  
                     Every kind that lives, Fomented by his virtual
                     power, and warmed.                              --Milton.
  
      2. Being in essence or effect, not in fact; as, the virtual
            presence of a man in his agent or substitute.
  
                     A thing has a virtual existence when it has all the
                     conditions necessary to its actual existence.
                                                                              --Fleming.
  
                     To mask by slight differences in the manners a
                     virtual identity in the substance.      --De Quincey.
  
      {Principle of virtual velocities} (Mech.), the law that when
            several forces are in equilibrium, the algebraic sum of
            their virtual moments is equal to zero.
  
      {Virtual focus} (Opt.), the point from which rays, having
            been rendered divergent by reflection of refraction,
            appear to issue; the point at which converging rays would
            meet if not reflected or refracted before they reach it.
           
  
      {Virtual image}. (Optics) See under {Image}.
  
      {Virtual moment} (of a force) (Mech.), the product of the
            intensity of the force multiplied by the virtual velocity
            of its point of application; -- sometimes called {virtual
            work}.
  
      {Virtual velocity} (Mech.), a minute hypothetical
            displacement, assumed in analysis to facilitate the
            investigation of statical problems. With respect to any
            given force of a number of forces holding a material
            system in equilibrium, it is the projection, upon the
            direction of the force, of a line joining its point of
            application with a new position of that point indefinitely
            near to the first, to which the point is conceived to have
            been moved, without disturbing the equilibrium of the
            system, or the connections of its parts with each other.
            Strictly speaking, it is not a velocity but a length.
  
      {Virtual work}. (Mech.) See {Virtual moment}, above.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Virtual \Vir"tu*al\ (?; 135), a. [Cf. F. virtuel. See {Virtue}.]
      1. Having the power of acting or of invisible efficacy
            without the agency of the material or sensible part;
            potential; energizing.
  
                     Heat and cold have a virtual transition, without
                     communication of substance.               --Bacon.
  
                     Every kind that lives, Fomented by his virtual
                     power, and warmed.                              --Milton.
  
      2. Being in essence or effect, not in fact; as, the virtual
            presence of a man in his agent or substitute.
  
                     A thing has a virtual existence when it has all the
                     conditions necessary to its actual existence.
                                                                              --Fleming.
  
                     To mask by slight differences in the manners a
                     virtual identity in the substance.      --De Quincey.
  
      {Principle of virtual velocities} (Mech.), the law that when
            several forces are in equilibrium, the algebraic sum of
            their virtual moments is equal to zero.
  
      {Virtual focus} (Opt.), the point from which rays, having
            been rendered divergent by reflection of refraction,
            appear to issue; the point at which converging rays would
            meet if not reflected or refracted before they reach it.
           
  
      {Virtual image}. (Optics) See under {Image}.
  
      {Virtual moment} (of a force) (Mech.), the product of the
            intensity of the force multiplied by the virtual velocity
            of its point of application; -- sometimes called {virtual
            work}.
  
      {Virtual velocity} (Mech.), a minute hypothetical
            displacement, assumed in analysis to facilitate the
            investigation of statical problems. With respect to any
            given force of a number of forces holding a material
            system in equilibrium, it is the projection, upon the
            direction of the force, of a line joining its point of
            application with a new position of that point indefinitely
            near to the first, to which the point is conceived to have
            been moved, without disturbing the equilibrium of the
            system, or the connections of its parts with each other.
            Strictly speaking, it is not a velocity but a length.
  
      {Virtual work}. (Mech.) See {Virtual moment}, above.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Image \Im"age\, n. [F., fr. L. imago, imaginis, from the root of
      imitari to imitate. See {Imitate}, and cf. {Imagine}.]
      1. An imitation, representation, or similitude of any person,
            thing, or act, sculptured, drawn, painted, or otherwise
            made perceptible to the sight; a visible presentation; a
            copy; a likeness; an effigy; a picture; a semblance.
  
                     Even like a stony image, cold and numb. --Shak.
  
                     Whose is this image and superscription? --Matt.
                                                                              xxii. 20.
  
                     This play is the image of a murder done in Vienna.
                                                                              --Shak.
  
                     And God created man in his own image. --Gen. i. 27.
  
      2. Hence: The likeness of anything to which worship is paid;
            an idol. --Chaucer.
  
                     Thou shalt not make unto thee any graven image, . .
                     . thou shalt not bow down thyself to them. --Ex. xx.
                                                                              4, 5.
  
      3. Show; appearance; cast.
  
                     The face of things a frightful image bears.
                                                                              --Dryden.
  
      4. A representation of anything to the mind; a picture drawn
            by the fancy; a conception; an idea.
  
                     Can we conceive Image of aught delightful, soft, or
                     great?                                                --Prior.
  
      5. (Rhet.) A picture, example, or illustration, often taken
            from sensible objects, and used to illustrate a subject;
            usually, an extended metaphor. --Brande & C.
  
      6. (Opt.) The figure or picture of any object formed at the
            focus of a lens or mirror, by rays of light from the
            several points of the object symmetrically refracted or
            reflected to corresponding points in such focus; this may
            be received on a screen, a photographic plate, or the
            retina of the eye, and viewed directly by the eye, or with
            an eyeglass, as in the telescope and microscope; the
            likeness of an object formed by reflection; as, to see
            one's image in a mirror.
  
      {Electrical image}. See under {Electrical}.
  
      {Image breaker}, one who destroys images; an iconoclast.
  
      {Image graver}, {Image maker}, a sculptor.
  
      {Image worship}, the worship of images as symbols; iconolatry
            distinguished from idolatry; the worship of images
            themselves.
  
      {Image Purkinje} (Physics), the image of the retinal blood
            vessels projected in, not merely on, that membrane.
  
      {Virtual image} (Optics), a point or system of points, on one
            side of a mirror or lens, which, if it existed, would emit
            the system of rays which actually exists on the other side
            of the mirror or lens. --Clerk Maxwell.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Virtual \Vir"tu*al\ (?; 135), a. [Cf. F. virtuel. See {Virtue}.]
      1. Having the power of acting or of invisible efficacy
            without the agency of the material or sensible part;
            potential; energizing.
  
                     Heat and cold have a virtual transition, without
                     communication of substance.               --Bacon.
  
                     Every kind that lives, Fomented by his virtual
                     power, and warmed.                              --Milton.
  
      2. Being in essence or effect, not in fact; as, the virtual
            presence of a man in his agent or substitute.
  
                     A thing has a virtual existence when it has all the
                     conditions necessary to its actual existence.
                                                                              --Fleming.
  
                     To mask by slight differences in the manners a
                     virtual identity in the substance.      --De Quincey.
  
      {Principle of virtual velocities} (Mech.), the law that when
            several forces are in equilibrium, the algebraic sum of
            their virtual moments is equal to zero.
  
      {Virtual focus} (Opt.), the point from which rays, having
            been rendered divergent by reflection of refraction,
            appear to issue; the point at which converging rays would
            meet if not reflected or refracted before they reach it.
           
  
      {Virtual image}. (Optics) See under {Image}.
  
      {Virtual moment} (of a force) (Mech.), the product of the
            intensity of the force multiplied by the virtual velocity
            of its point of application; -- sometimes called {virtual
            work}.
  
      {Virtual velocity} (Mech.), a minute hypothetical
            displacement, assumed in analysis to facilitate the
            investigation of statical problems. With respect to any
            given force of a number of forces holding a material
            system in equilibrium, it is the projection, upon the
            direction of the force, of a line joining its point of
            application with a new position of that point indefinitely
            near to the first, to which the point is conceived to have
            been moved, without disturbing the equilibrium of the
            system, or the connections of its parts with each other.
            Strictly speaking, it is not a velocity but a length.
  
      {Virtual work}. (Mech.) See {Virtual moment}, above.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Moment \Mo"ment\, n. [F. moment, L. momentum, for movimentum
      movement, motion, moment, fr. movere to move. See {Move}, and
      cf. {Momentum}, {Movement}.]
      1. A minute portion of time; a point of time; an instant; as,
            at thet very moment.
  
                     In a moment, in the twinkling of an eye. --1 Cor.
                                                                              xv. 52.
  
      2. Impulsive power; force; momentum.
  
                     The moments or quantities of motion in bodies.
                                                                              --Berkley.
  
                     Touch, with lightest moment of impulse, His free
                     will.                                                --Milton.
  
      3. Importance, as in influence or effect; consequence; weight
            or value; consideration.
  
                     Matters of great moment.                     --Shak.
  
                     It is an abstruse speculation, but also of far less
                     moment and consequence of us than the others.
                                                                              --Bentley.
  
      4. An essential element; a deciding point, fact, or
            consideration; an essential or influential circumstance.
  
      5. (Math.) An infinitesimal change in a varying quantity; an
            increment or decrement. [Obs.]
  
      6. (Mech.) Tendency, or measure of tendency, to produce
            motion, esp. motion about a fixed point or axis.
  
      {Moment of a couple} (Mech.), the product of either of its
            forces into the perpendicular distance between them.
  
      {Moment of a force}. (Mech.)
            (a) With respect to a point, the product of the intensity
                  of the force into the perpendicular distance from the
                  point to the line of direction of the force.
            (b) With respect to a line, the product of that component
                  of the force which is perpendicular to the plane
                  passing through the line and the point of application
                  of the force, into the shortest distance between the
                  line and this point.
            (c) With respect to a plane that is parallel to the force,
                  the product of the force into the perpendicular
                  distance of its point of application from the plane.
                 
  
      {Moment of inertia}, of a rotating body, the sum of the mass
            of each particle of matter of the body into the square of
            its distance from the axis of rotation; -- called also
            {moment of rotation} and {moment of the mass}.
  
      {Statical moment}, the product of a force into its leverage;
            the same as {moment of a force} with respect to a point,
            line, etc.
  
      {Virtual moment}. See under {Virtual}.
  
      Syn: Instant; twinkling; consequence; weight; force; value;
               consideration; signification; avail.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Velocity \Ve*loc"i*ty\, n.; pl. {Velocities}. [L. velocitas,
      from velox, -ocis, swift, quick; perhaps akin to v[?]lare to
      fly (see {Volatile}): cf. F. v[82]locit[82].]
      1. Quickness of motion; swiftness; speed; celerity; rapidity;
            as, the velocity of wind; the velocity of a planet or
            comet in its orbit or course; the velocity of a cannon
            ball; the velocity of light.
  
      Note: In such phrases, velocity is more generally used than
               celerity. We apply celerity to animals; as, a horse or
               an ostrich runs with celerity; but bodies moving in the
               air or in ethereal space move with greater or less
               velocity, not celerity. This usage is arbitrary, and
               perhaps not universal.
  
      2. (Mech.) Rate of motion; the relation of motion to time,
            measured by the number of units of space passed over by a
            moving body or point in a unit of time, usually the number
            of feet passed over in a second. See the Note under
            {Speed}.
  
      {Angular velocity}. See under {Angular}.
  
      {Initial velocity}, the velocity of a moving body at
            starting; especially, the velocity of a projectile as it
            leaves the mouth of a firearm from which it is discharged.
           
  
      {Relative velocity}, the velocity with which a body
            approaches or recedes from another body, whether both are
            moving or only one.
  
      {Uniform velocity}, velocity in which the same number of
            units of space are described in each successive unit of
            time.
  
      {Variable velocity}, velocity in which the space described
            varies from instant, either increasing or decreasing; --
            in the former case called accelerated velocity, in the
            latter, retarded velocity; the acceleration or retardation
            itself being also either uniform or variable.
  
      {Virtual velocity}. See under {Virtual}.
  
      Note: In variable velocity, the velocity, strictly, at any
               given instant, is the rate of motion at that instant,
               and is expressed by the units of space, which, if the
               velocity at that instant were continued uniform during
               a unit of time, would be described in the unit of time;
               thus, the velocity of a falling body at a given instant
               is the number of feet which, if the motion which the
               body has at that instant were continued uniformly for
               one second, it would pass through in the second. The
               scientific sense of velocity differs from the popular
               sense in being applied to all rates of motion, however
               slow, while the latter implies more or less rapidity or
               quickness of motion.
  
      Syn: Swiftness; celerity; rapidity; fleetness; speed.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Virtual \Vir"tu*al\ (?; 135), a. [Cf. F. virtuel. See {Virtue}.]
      1. Having the power of acting or of invisible efficacy
            without the agency of the material or sensible part;
            potential; energizing.
  
                     Heat and cold have a virtual transition, without
                     communication of substance.               --Bacon.
  
                     Every kind that lives, Fomented by his virtual
                     power, and warmed.                              --Milton.
  
      2. Being in essence or effect, not in fact; as, the virtual
            presence of a man in his agent or substitute.
  
                     A thing has a virtual existence when it has all the
                     conditions necessary to its actual existence.
                                                                              --Fleming.
  
                     To mask by slight differences in the manners a
                     virtual identity in the substance.      --De Quincey.
  
      {Principle of virtual velocities} (Mech.), the law that when
            several forces are in equilibrium, the algebraic sum of
            their virtual moments is equal to zero.
  
      {Virtual focus} (Opt.), the point from which rays, having
            been rendered divergent by reflection of refraction,
            appear to issue; the point at which converging rays would
            meet if not reflected or refracted before they reach it.
           
  
      {Virtual image}. (Optics) See under {Image}.
  
      {Virtual moment} (of a force) (Mech.), the product of the
            intensity of the force multiplied by the virtual velocity
            of its point of application; -- sometimes called {virtual
            work}.
  
      {Virtual velocity} (Mech.), a minute hypothetical
            displacement, assumed in analysis to facilitate the
            investigation of statical problems. With respect to any
            given force of a number of forces holding a material
            system in equilibrium, it is the projection, upon the
            direction of the force, of a line joining its point of
            application with a new position of that point indefinitely
            near to the first, to which the point is conceived to have
            been moved, without disturbing the equilibrium of the
            system, or the connections of its parts with each other.
            Strictly speaking, it is not a velocity but a length.
  
      {Virtual work}. (Mech.) See {Virtual moment}, above.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Virtual \Vir"tu*al\ (?; 135), a. [Cf. F. virtuel. See {Virtue}.]
      1. Having the power of acting or of invisible efficacy
            without the agency of the material or sensible part;
            potential; energizing.
  
                     Heat and cold have a virtual transition, without
                     communication of substance.               --Bacon.
  
                     Every kind that lives, Fomented by his virtual
                     power, and warmed.                              --Milton.
  
      2. Being in essence or effect, not in fact; as, the virtual
            presence of a man in his agent or substitute.
  
                     A thing has a virtual existence when it has all the
                     conditions necessary to its actual existence.
                                                                              --Fleming.
  
                     To mask by slight differences in the manners a
                     virtual identity in the substance.      --De Quincey.
  
      {Principle of virtual velocities} (Mech.), the law that when
            several forces are in equilibrium, the algebraic sum of
            their virtual moments is equal to zero.
  
      {Virtual focus} (Opt.), the point from which rays, having
            been rendered divergent by reflection of refraction,
            appear to issue; the point at which converging rays would
            meet if not reflected or refracted before they reach it.
           
  
      {Virtual image}. (Optics) See under {Image}.
  
      {Virtual moment} (of a force) (Mech.), the product of the
            intensity of the force multiplied by the virtual velocity
            of its point of application; -- sometimes called {virtual
            work}.
  
      {Virtual velocity} (Mech.), a minute hypothetical
            displacement, assumed in analysis to facilitate the
            investigation of statical problems. With respect to any
            given force of a number of forces holding a material
            system in equilibrium, it is the projection, upon the
            direction of the force, of a line joining its point of
            application with a new position of that point indefinitely
            near to the first, to which the point is conceived to have
            been moved, without disturbing the equilibrium of the
            system, or the connections of its parts with each other.
            Strictly speaking, it is not a velocity but a length.
  
      {Virtual work}. (Mech.) See {Virtual moment}, above.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Virtual \Vir"tu*al\ (?; 135), a. [Cf. F. virtuel. See {Virtue}.]
      1. Having the power of acting or of invisible efficacy
            without the agency of the material or sensible part;
            potential; energizing.
  
                     Heat and cold have a virtual transition, without
                     communication of substance.               --Bacon.
  
                     Every kind that lives, Fomented by his virtual
                     power, and warmed.                              --Milton.
  
      2. Being in essence or effect, not in fact; as, the virtual
            presence of a man in his agent or substitute.
  
                     A thing has a virtual existence when it has all the
                     conditions necessary to its actual existence.
                                                                              --Fleming.
  
                     To mask by slight differences in the manners a
                     virtual identity in the substance.      --De Quincey.
  
      {Principle of virtual velocities} (Mech.), the law that when
            several forces are in equilibrium, the algebraic sum of
            their virtual moments is equal to zero.
  
      {Virtual focus} (Opt.), the point from which rays, having
            been rendered divergent by reflection of refraction,
            appear to issue; the point at which converging rays would
            meet if not reflected or refracted before they reach it.
           
  
      {Virtual image}. (Optics) See under {Image}.
  
      {Virtual moment} (of a force) (Mech.), the product of the
            intensity of the force multiplied by the virtual velocity
            of its point of application; -- sometimes called {virtual
            work}.
  
      {Virtual velocity} (Mech.), a minute hypothetical
            displacement, assumed in analysis to facilitate the
            investigation of statical problems. With respect to any
            given force of a number of forces holding a material
            system in equilibrium, it is the projection, upon the
            direction of the force, of a line joining its point of
            application with a new position of that point indefinitely
            near to the first, to which the point is conceived to have
            been moved, without disturbing the equilibrium of the
            system, or the connections of its parts with each other.
            Strictly speaking, it is not a velocity but a length.
  
      {Virtual work}. (Mech.) See {Virtual moment}, above.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Virtuality \Vir`tu*al"i*ty\, n. [Cf. F. virtualit[82].]
      1. The quality or state of being virtual.
  
      2. Potentiality; efficacy; potential existence. [Obs.]
  
                     In one grain of corn, there lieth dormant a
                     virtuality of many other.                  --Sir T.
                                                                              Browne.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Virtually \Vir"tu*al*ly\, adv.
      In a virtual manner; in efficacy or effect only, and not
      actually; to all intents and purposes; practically.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Virtueless \Vir"tue*less\, a.
      Destitute of virtue; without efficacy or operating qualities;
      powerless.
  
               Virtueless she wished all herbs and charms. --Fairfax.

From U.S. Gazetteer (1990) [gazetteer]:
   Veradale, WA (CDP, FIPS 74725)
      Location: 47.64945 N, 117.20752 W
      Population (1990): 7836 (2724 housing units)
      Area: 8.0 sq km (land), 0.0 sq km (water)
      Zip code(s): 99037

From U.S. Gazetteer (1990) [gazetteer]:
   Verdel, NE (village, FIPS 50335)
      Location: 42.81148 N, 98.19294 W
      Population (1990): 59 (37 housing units)
      Area: 0.5 sq km (land), 0.0 sq km (water)
      Zip code(s): 68760

From Jargon File (4.2.0, 31 JAN 2000) [jargon]:
   virtual adj.   [via the technical term `virtual memory', prob.
   from the term `virtual image' in optics] 1. Common alternative to
   {logical}; often used to refer to the artificial objects (like
   addressable virtual memory larger than physical memory) simulated by
   a computer system as a convenient way to manage access to shared
   resources.   2. Simulated; performing the functions of something that
   isn't really there.   An imaginative child's doll may be a virtual
   playmate.   Oppose {real}.
  
  

From Jargon File (4.2.0, 31 JAN 2000) [jargon]:
   virtual beer n.   Praise or thanks. Used universally in the
   Linux community. Originally this term signified cash, after a famous
   incident in which some some Britishers who wanted to buy Linus a
   beer and sent him money to Finland to do so.
  
  

From Jargon File (4.2.0, 31 JAN 2000) [jargon]:
   virtual Friday n.   (also `logical Friday') The last day before
   an extended weekend, if that day is not a `real' Friday.   For
   example, the U.S. holiday Thanksgiving is always on a Thursday.   The
   next day is often also a holiday or taken as an extra day off, in
   which case Wednesday of that week is a virtual Friday (and Thursday
   is a virtual Saturday, as is Friday).   There are also `virtual
   Mondays' that are actually Tuesdays, after the three-day weekends
   associated with many national holidays in the U.S.
  
  

From Jargon File (4.2.0, 31 JAN 2000) [jargon]:
   virtual reality n.   1. Computer simulations that use 3-D
   graphics and devices such as the Dataglove to allow the user to
   interact with the simulation.   See {cyberspace}.   2. A form of
   network interaction incorporating aspects of role-playing games,
   interactive theater, improvisational comedy, and `true confessions'
   magazines.   In a virtual reality forum (such as Usenet's
   alt.callahans newsgroup or the {MUD} experiments on Internet),
   interaction between the participants is written like a shared novel
   complete with scenery, `foreground characters' that may be personae
   utterly unlike the people who write them, and common `background
   characters' manipulable by all parties.   The one iron law is that
   you may not write irreversible changes to a character without the
   consent of the person who `owns' it.   Otherwise anything goes.   See
   {bamf}, {cyberspace}, {teledildonics}.
  
  

From Jargon File (4.2.0, 31 JAN 2000) [jargon]:
   virtual shredder n.   The jargonic equivalent of the {bit
   bucket} at shops using IBM's VM/CMS operating system.   VM/CMS
   officially supports a whole bestiary of virtual card readers,
   virtual printers, and other phantom devices; these are used to
   supply some of the same capabilities Unix gets from pipes and I/O
   redirection.
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual
  
      (Via the technical term {virtual
      memory}, probably from the term "virtual image" in optics)
      1. Common alternative to {logical}; often used to refer to the
      artificial objects (like addressable {virtual memory} larger
      than physical memory) created by a computer system to help the
      system control access to shared resources.
  
      2. Simulated; performing the functions of something that isn't
      really there.   An imaginative child's doll may be a virtual
      playmate.
  
      Opposite of {real} or physical.
  
      [{Jargon File}]
  
      (1994-11-30)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual 86 mode
  
      (Or "virtual mode" or "virtual 8086
      mode") An operating mode provided by the {Intel 80386} and
      later processors to allow {real mode} programs to run under
      {operating system}s which use {protected mode}.   In this
      sub-mode of protected mode, an operating environment is
      created which mimics the address calculation in real mode.
  
      In virtual 86 mode the segment {MMU} is practically turned off
      and the {segment register}s exhibit the same behaviour as in
      real mode.   The {page}d MMU, however, still operates.   This
      means that the one megabyte {address space} of real mode can
      be remapped in four kilobyte {page}s to anywhere in the 32 bit
      {physical address} space.   Each page can be protected
      separately from read or write accesses.
  
      Virtual mode is handled on a per-task-basis, so each
      {exception} (from protection violations or {interrupt}s)
      switches the processor back into protected mode.   It is
      therefore possible to have multiple tasks in virtual mode
      which run {concurrent}ly under the control of an operating
      system which runs in protected mode.
  
      Most operating system services in {MS-DOS} systems are called
      by {software interrupt}s, which are a kind of exception.   If
      an MS-DOS application runs in virtual mode under the control
      of a protected mode operating system, each call to MS-DOS
      causes a switch to protected mode.   The operating system
      emulates the MS-DOS service and switches back to the
      application in virtual mode.   From the viewpoint of the
      application nothing differs from real mode.
  
      {Microsoft Windows}, {Windows NT}, and {OS/2} use this feature
      to implement "DOS-boxes" in which both MS-DOS and real mode
      {application program}s can run.
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual address
  
      1. A memory location accessed by an
      {application program} in a system with {virtual memory} such
      that intervening hardware and/or software maps the virtual
      address to real ({physical}) memory.   During the course of
      execution of an application, the same virtual address may be
      mapped to many different {physical addresses} as data and
      programs are {paged out} and {paged in} to other locations.
  
      2. In {IBM}'s {VM} {operating system}, {Virtual Device
      Location}.
  
      (2001-01-02)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual cache
  
      A {cache} which uses {virtual address}, i.e. it is between the
      processor and the {memory management unit}.   A virtual cache
      cannot recognise external access to physical address, e.g. from
      {DMA}.   The whole cache must be flushed when swapping between
      tasks which share same virtual {address space}.
  
      (1994-11-30)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual circuit
  
      A {connection-oriented} {network} service which
      is implemented on top of a network which may be either
      connection-oriented or {connectionless} ({packet switching}).
  
      The term "switched virtual circuit" was coined needlessly to
      distinguish an ordinary virtual circuit from a {permanent
      virtual circuit}.   (One of the perpetrators of this confusion
      appears to be ["Networking Essentials", 1996, Microsoft Press,
      ISBN 1-55615-806-8], a book aimed at people preparing for the
      {MCSE} exam on {LANs} and {WANs}).
  
      Not to be confused with {switched virtual connection}.
  
      (2001-10-26)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Circuit Identifier
  
      (VCID) An identifier used for the {routing} of a
      {virtual circuit}.   An {ATM} {switch} may route according to a
      Virtual Circuit Identifier, a {Virtual Path Identifier}, or a
      combination.
  
      (2001-05-16)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual connection
  
      1. (VC) A connection or a path through an {ATM}
      network.   The word "{virtual}" indicates that the connection
      is {logical} rather than {physical}.
  
      Nothing to do with a {virtual circuit} on a {packet switching}
      network.
  
      [Fred Halsall, "Data Communications, Computer Networks and
      Open Systems", 1996, Addison Wesley].
  
      2. A communications link that appears to be a direct
      connection between sender and receiver, although physically
      the link can be routed through a more circuitous path, running
      over {virtual circuits} instead of a private network built
      primarily with {dedicated lines}.
  
      A virtual connection can provide full-time connection among
      many sites, including those configured for {SNA}/{SDLC}
      {protocol}.   A virtual connection can handle any transmission
      protocol and is supported worldwide.   It can provide high
      throughput and low delay for {LAN} and {Internet}
      applications, peer-to-peer connectivity, client-server
      computing, and other distributed processing applications.
  
      [Same as {virtual circuit}?]
  
      (2001-10-26)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Control Program Interface
  
      (VCPI) An alternative, and incompatible method for doing the
      same thing as {DOS Protected Mode Interface} (DPMI).
  
      (1995-01-12)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Device Driver
  
      (VxD) A {device driver} under {Windows
      3.x}/{Windows 95} running as part of the {kernel} and thus
      having access to the memory of the kernel and all running
      processes as well as raw access to the hardware.   VxD's
      usually have the {filename extension} .386 under Windows 3.x
      and .vxd under Windows 95.   VxD's written for Windows 3.x can
      be used under Windows 95 but not vice versa.
  
      (1997-02-27)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Device Location
  
      (Or "Virtual Address") The address of a device (e.g. disk,
      printer, terminal) belonging to a "guest" {operating system}.
      Such an address is mapped to a physical device.   VM may remap
      several virtual disks to different parts of a single physical
      disk.
  
      (1995-02-22)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual disk
  
      {RAM disk}
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Home Environment
  
      (VHE) A tool for using {NFS} on {HP UX}.
  
      (1994-12-07)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual host
  
      Most computers on the {Internet} have a single
      {Internet address}; however, often via special {kernel}
      patches, a given computer can be made to respond to several
      {IP} addresses and provide different {services} (typically
      different {Web} services) on each.   Each of these different IP
      addresess (which generally each have their own {hostname}) act
      as if they were distinct hosts on distinct machines, even
      though they are actually all one host.   Hence, they are
      {virtual} hosts.   A common use is when an {Internet Service
      Provider} "hosts" {World-Wide Web} or other services for
      several of their customers on one computer but giving the
      appearence that they are separate servers.
  
      (1997-09-11)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual LAN
  
      Software defined groups of {host} on a {local
      area network} (LAN) that communicate as if they were on the
      same wire, even though they are physically on different {LAN
      segment}s throughout a site.   To define a virtual LAN, the
      {network administrator} uses a virtual LAN management utility
      to establish membersip rules that determine which hostss are
      in a specific virtual LAN.   Many models may exist but two seem
      to dominate:
  
      (1) Vitual Segment (or Port-Group) Virtual LAN.   These are
      switched at the {data link layer} ({OSI} layer 2).   Virtual
      segments turn an arbitrary number of physical segments into a
      single virtual segment that funtions as a self-contained
      traffic domain.
  
      (2) Virtual Subnet Virtual LAN: These are switched at the
      {Network Layer} ({OSI} layer 3).   Subnet-oriented virtual LANs
      are based on {subnet address}es used by {IP}, {IPX}, and other
      {network layer} {protocol}s to normally identify physical
      networks.   Administrators assign one subnet address to a
      number of switch {port}s (which may be on different switches
      and over a backbone).   Once identified as a virtual subnet,
      the selected LANs function as a {bridge group} - traffic is
      bridged at Layer 2 within the virtual subnet and routed at
      Layer 3 between virtual subnets.
  
      ["The many faces of virtual LANs", Steven King, Network
      World, 1994/5?].
  
      (1995-04-03)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Loadable Module
  
      (VLM) {Novell}'s term for software modules that
      can be dynamically loaded to extend the functionality of the
      "VLM" {NetWare Requester} for {MS-DOS} that became standard
      beginning with {Novell NetWare} 4.
  
      (1995-01-11)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Local Area Network
  
      (VLAN) A logical grouping of two or more {nodes}
      which are not necessarily on the same physical {network
      segment} but which share the same {IP} {network number}.   This
      is often associated with {switched Ethernet}.
  
      IEEE 802.1Q is a VLAN standard.
  
      [Confirm?   Better description?   Reference?]
  
      (2002-08-30)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual machine
  
      1. An {abstract machine} for which an {interpreter} exists.
      Virtual machines are often used in the implementation of
      portable executors for {high-level languages}.   The HLL is
      compiled into code for the virtual machine (an {intermediate
      language}) which is then executed by an {interpreter} written
      in {assembly language} or some other portable language like
      {C}.
  
      Examples are {Core War}, {Java Virtual Machine}, {OCODE},
      {OS/2}, {POPLOG}, {Portable Scheme Interpreter}, {Portable
      Standard Lisp}, {Parallel Virtual Machine}, {Sequential Parlog
      Machine}, {SNOBOL Implementation Language}, {SODA},
      {Smalltalk}.
  
      2. A software emulation of a physical computing environment.
  
      The term gave rise to the name of {IBM}'s {VM} {operating
      system} whose task is to provide one or more simultaneous
      execution environments in which operating systems or other
      programs may execute as though they were running "on the bare
      iron", that is, without an eveloping Control Program.   A major
      use of VM is the running of both outdated and current versions
      of the same operating system on a single {CPU} complex for the
      purpose of system migration, thereby obviating the need for a
      second processor.
  
      (2002-04-15)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Machine
  
      (VM) An {IBM} pseudo-{operating system}
      {hypervisor} running on {IBM 370}, {ESA} and {IBM 390}
      architecture computers.
  
      VM comprises CP ({Control Program}) and CMS ({Conversational
      Monitor System}) providing Hypervisor and personal computing
      environments respectively.   VM became most used in the early
      1980s as a Hypervisor for multiple {DOS/VS} and {DOS/VSE}
      systems and as IBM's internal operating system of choice.   It
      declined rapidly following widespread adoption of the {IBM PC}
      and hardware partitioning in {microcode} on IBM {mainframes}
      after the {IBM 3090}.
  
      VM has been known as VM/SP (System Product, the successor to
      {CP/67}), VM/XA, and currently as VM/ESA (Enterprise Systems
      Architecture).   VM/ESA is still in used in 1999, featuring a
      {web} interface, {Java}, and {DB2}.   It is still a major IBM
      operating system.
  
      {Home (http://vmdev.gpl.ibm.com/)}.
  
      ["History of VM"(?), Melinda Varian, Princeton University].
  
      (1999-10-31)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual machine
  
      1. An {abstract machine} for which an {interpreter} exists.
      Virtual machines are often used in the implementation of
      portable executors for {high-level languages}.   The HLL is
      compiled into code for the virtual machine (an {intermediate
      language}) which is then executed by an {interpreter} written
      in {assembly language} or some other portable language like
      {C}.
  
      Examples are {Core War}, {Java Virtual Machine}, {OCODE},
      {OS/2}, {POPLOG}, {Portable Scheme Interpreter}, {Portable
      Standard Lisp}, {Parallel Virtual Machine}, {Sequential Parlog
      Machine}, {SNOBOL Implementation Language}, {SODA},
      {Smalltalk}.
  
      2. A software emulation of a physical computing environment.
  
      The term gave rise to the name of {IBM}'s {VM} {operating
      system} whose task is to provide one or more simultaneous
      execution environments in which operating systems or other
      programs may execute as though they were running "on the bare
      iron", that is, without an eveloping Control Program.   A major
      use of VM is the running of both outdated and current versions
      of the same operating system on a single {CPU} complex for the
      purpose of system migration, thereby obviating the need for a
      second processor.
  
      (2002-04-15)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Machine
  
      (VM) An {IBM} pseudo-{operating system}
      {hypervisor} running on {IBM 370}, {ESA} and {IBM 390}
      architecture computers.
  
      VM comprises CP ({Control Program}) and CMS ({Conversational
      Monitor System}) providing Hypervisor and personal computing
      environments respectively.   VM became most used in the early
      1980s as a Hypervisor for multiple {DOS/VS} and {DOS/VSE}
      systems and as IBM's internal operating system of choice.   It
      declined rapidly following widespread adoption of the {IBM PC}
      and hardware partitioning in {microcode} on IBM {mainframes}
      after the {IBM 3090}.
  
      VM has been known as VM/SP (System Product, the successor to
      {CP/67}), VM/XA, and currently as VM/ESA (Enterprise Systems
      Architecture).   VM/ESA is still in used in 1999, featuring a
      {web} interface, {Java}, and {DB2}.   It is still a major IBM
      operating system.
  
      {Home (http://vmdev.gpl.ibm.com/)}.
  
      ["History of VM"(?), Melinda Varian, Princeton University].
  
      (1999-10-31)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Machine Environment
  
      (VME) {ICL}'s {mainframe} {operating
      system}.
  
      (1995-06-28)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Machine/Conversational Monitor System
  
      (VM/CMS) An {IBM} {time-sharing} and
      personal computing environment executing under {Virtual
      Machine} (VM) in a virtual machine environment.   VM/CMS is
      designed to support large numbers of {interactive} users.   It
      relies on numerous {API}s into the {Control Program} (CP) to
      provide very efficient single-user processing
  
      VM/CMS was only adopted some time after the original design of
      {Virtual Machine} as a more efficient personal computing
      environment than {MVS/TSO}.
  
      (1999-01-19)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Machine/ESA
  
      {Virtual Machine}
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Machine/System Product
  
      {Virtual Machine}
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Machine/XA
  
      {Virtual Machine}
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual memory
  
      A system allowing a computer program to
      behave as though the computer's memory was larger than the
      actual {physical} {RAM}.   The excess is stored on {hard disk}
      and copied to RAM as required.
  
      Virtual memory is usually much larger than physical memory,
      making it possible to run programs for which the total code
      plus data size is greater than the amount of RAM available.
      This is known as "{demand paged} virtual memory".   A page is
      copied from disk to RAM ("paged in") when an attempt is made
      to access it and it is not already present.   This paging is
      performed automatically by collaboration between the {CPU},
      the {memory management unit} (MMU), and the {operating system}
      {kernel}.   The program is unaware of virtual memory, it just
      sees a large {address space}, only part of which corresponds
      to physical memory at any instant.
  
      The virtual {address space} is divided into {pages}.   Each
      {virtual address} output by the {CPU} is split into a
      (virtual) {page} number (the most significant bits) and an
      offset within the page (the N least significant bits).   Each
      page thus contains 2^N {bytes} (or whatever the unit of
      addressing is).   The offset is left unchanged and the {memory
      management unit} (MMU) maps the virtual page number to a
      {physical} page number.   This is recombined with the offset to
      give a {physical address} - a location in {physical memory}
      ({RAM}).
  
      The performance of a program will depend dramatically on how
      its memory access pattern interacts with the paging scheme.
      If accesses exhibit a lot of {locality of reference},
      i.e. each access tends to be close to previous accesses, the
      performance will be better than if accesses are randomly
      distributed over the program's {address space} thus requiring
      more paging.
  
      In a {multitasking} system, physical memory may contain pages
      belonging to several programs.   Without {demand paging}, an OS
      would need to allocate physical memory for the whole of every
      active program and its data.   Such a system might still use an
      {MMU} so that each program could be located at the same
      {virtual address} and not require run-time relocation.   Thus
      virtual addressing does not necessarily imply the existence of
      virtual memory.   Similarly, a {multitasking} system might load
      the whole program and its data into physical memory when it is
      to be executed and copy it all out to disk when its
      {timeslice} expired.   Such "swapping" does not imply virtual
      memory and is less efficient than paging.
  
      Some {application programs} implement virtual memory wholly in
      software, by translating every virtual memory access into a
      file access, but efficient virtual memory requires hardware
      and operating system support.
  
      (2002-11-26)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Memory System
  
      (VMS) {DEC}'s proprietary {operating
      system} originally produced for its {VAX} {minicomputer}.
  
      VMS V1 was released in August 1978.   VMS was renamed "OpenVMS"
      around version 5.5.   The first version of VMS on {DEC Alpha}
      was known as OpenVMS for AXP V1.0, and the correct way to
      refer to the operating system now is OpenVMS for VAX or
      OpenVMS for Alpha.   The renaming also signified the fact that
      the {X/Open} consortium had certified OpenVMS as having a high
      support for {POSIX} standards.
  
      VMS is one of the most secure operating systems on the market
      (making it popular in financial institutions).   It currently
      (October 1997) has the best {clustering} capability (both
      number and distance) and is very scalable with {binaries}
      portable from small desktop {workstations} up to huge
      {mainframes}.
  
      Many {Unix} fans generously concede that VMS would probably be
      the {hacker}'s favourite commercial OS if Unix didn't exist;
      though true, this makes VMS fans furious.
  
      {FAQ
      (http://www.cis.ohio-state.edu/hypertext/faq/bngusenet/comp/os/vms/top.html)}.
  
      {Usenet} newsgroup: {news:comp.os.vms}.
  
      [How does its performance compare with other OSes?]
  
      (1999-06-03)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual path
  
      The location of a file or directory on a
      particular {server}, as seen by a remote {client} accessing it
      via {World-Wide Web} (or similar distributed document
      service).
  
      A virtual path provides access to files outside the default
      directory and subdirectories.   It appears in the form
      ".../~name/..." where "~name" is replaced with actual path
      configured by the administrator.   An {access control list} can
      be associated with a virtual path.
  
      (1995-04-13)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual point of presence
  
      (virtual PoP) A point, via which users can connect to an
      {Internet access provider}, which is not operated by the
      provider.   The user is charged by the telephone company for
      the call to the virtual point of presence which relays his
      call via some third party circuit to the Internet provider's
      central location.   This is in contrast to a physical {point of
      presence} (PoP) which is operated by the Internet provider
      themselves.   The advantage of a virtual PoP is that the
      provider can keep all their {modem}s in one location, thus
      improving availability and maintenance, but users do not have
      to pay long-distance call charges to that point.
  
      (1994-12-13)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual PoP
  
      {virtual point of presence}
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Private Network
  
      (VPN) The use of {encryption} in the
      lower {protocol layers} to provide a secure connection through
      an otherwise insecure network, typically the {Internet}.   VPNs
      are generally cheaper than real private networks using private
      lines but rely on having the same encryption system at both
      ends.   The encryption may be performed by {firewall} software
      or possibly by {routers}.
  
      Link-level (layer 2 and 3) encryption provides extra
      protection by encrypting all of each {datagram} except the
      link-level information.   This prevents a listener from
      obtaining information about network structure.   While
      link-level encryption prevents traffic analysis (a form of
      attack), it must encrypt/decrypt on every {hop} and every
      path.
  
      Protocol-level encryption (layer 3 and 4) encryption encrypts
      protocol data but leaves protocol and link headers clear.
      While protocol-level encryption requires you to
      encrypt/decrypt data only once, and it encrypts/decrypts only
      those sessions that need it, headers are sent as clear text,
      allowing traffic analysis.
  
      Application (layer 5 up) encryption is based on a particular
      application and requires that the application be modified to
      incorporate encryption.
  
      {Cisco
      (http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/cnfg_nts/rsm/rsm_pa/4801encr.htm)}.
  
      (1999-11-15)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual reality
  
      (VR)
  
      1. Computer simulations that use 3D graphics and
      devices such as the {data glove} to allow the user to interact
      with the simulation.
  
      2. A form of network interaction incorporating aspects
      of role-playing games, interactive theater, improvisational
      comedy, and "true confessions" magazines.   In a virtual
      reality forum (such as {Usenet}'s {news:alt.callahans}
      newsgroup or the {MUD} experiments on {Internet} and
      elsewhere), interaction between the participants is written
      like a shared novel complete with scenery, "foreground
      characters" that may be personae utterly unlike the people who
      write them, and common "background characters" manipulable by
      all parties.   The one iron law is that you may not write
      irreversible changes to a character without the consent of the
      person who "owns" it, otherwise, anything goes.
  
      See {bamf}, {cyberspace}.
  
      [{Jargon File}]
  
      (1995-01-30)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Reality Modeling Language
  
      (VRML) A draft specification for
      the design and implementation of a {platform}-independent
      language for {virtual reality} scene description.
  
      VRML 1.0 was released on 1995-05-26.
  
      {Home (http://www.vrml.org/)}.
  
      {Wired (http://vrml.wired.com/)}.
  
      {Hypermail Archive (http://vrml.wired.com/arch/)}.
  
      Mailing list: (message body: "subscribe
      www-vrml your-email-address").
  
      (1995-07-20)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Sequential Access Method
  
      {Virtual Storage Access Method}
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual server
  
      A configuration of a {World-Wide Web}
      {server} that appears to {clients} as an independent server
      but which is actually running on a computer that is shared by
      any number of other virtual servers.   Each virtual server can
      be configured as an independent {web site}, with its own
      {hostname}, content, and security settings.
  
      {DNS} maps the hostnames of all virtual servers on one
      physical server to its {IP address}.   The web server software
      then uses the "Host" header in the {HTTP} request to determine
      which virtual server the request was for, and then processes
      the request using that virtual server's configuration.
  
      Virtual servers allow {Internet Service Providers} to share
      one computer between multiple {web sites} while allowing the
      owner of each web site to use and administer the server as
      though they had complete control.
  
      (2003-06-23)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   virtual shredder
  
      The jargon equivalent of the {bit bucket} at shops using
      {IBM}'s {VM/CMS} {operating system}.   VM/CMS officially
      supports a whole bestiary of virtual card readers, virtual
      printers, and other phantom devices; these are used to supply
      some of the same capabilities {Unix} gets from {pipe}s and
      {I/O redirection}.
  
      [{Jargon File}]
  
      (1995-01-30)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Software Factory
  
      (VSF) A product from {Systematica} which
      allows users to develop {CASE} tools appropriate to any
      software engineering methodology.
  
      (1997-06-09)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Storage Access Method
  
      (VSAM) An {IBM} disk file storage scheme first used
      in {S/370} and virtual storage.   VSAM comprises three access
      methods: {Keyed Sequenced Data Set} (KSDS), {Relative Record
      Data Set} (RRDS), and {Entry Sequenced Data Set} (ESDS).
  
      Both {IMS/DB} and {DB2} are implemented on top of VSAM and use
      its underlying data structures.
  
      ["Storage" or "Sequential"?]
  
      (2002-07-26)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Storage Extended
  
      (VSE, formerly DOS/VSE) is a
      {multitasking}, {IBM 370}-architected {operating system}
      similar to {Multiple Virtual Storage} (MVS).
  
      VSE run jobs in {partitions} rather than {address spaces}, and
      uses {POWER} for input/output rather than {JES}, but is
      largely similar to MVS.   Subsequent VSE/{ESA} releases gave
      VSE the {XA-370} channel architecture, 31-bit virtual and real
      storage support, and data spaces.   VSE is the {IBM} operating
      system on one-third of installed {IBM 4381}s and a significant
      proportion of {IBM 9370}s as well.   It offers {transaction
      processing} and {batch processing} capabilities well beyond
      {Virtual Machine}'s current capabilities, and has a close
      affinity with MVS.
  
      (1997-06-09)
  
  

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   Virtual Telecommunications Access Method
  
      (VTAM) A data communications access method compatible with
      {IBM}'s {Systems Network Architecture}.
  
      [More detail?]
  
      (1995-01-30)
  
  
No guarantee of accuracy or completeness!
©TU Chemnitz, 2006-2024
Your feedback:
Ad partners