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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.
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.
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.
virus n. [from the obvious analogy with biological viruses, via SF] A cracker program that searches out other programs and 'infects' them by embedding a copy of itself in them, so that they become Trojan horses. When these programs are executed, the embedded virus is executed too, this propagating the 'infection'. This normally happens invisibly to the user. Unlike a worm, a virus cannot infect other computers without assistance. It is propagated by vectors such as humans trading programs with their friends (see SEX). The virus may do nothing but propagate itself and then allow the program to run normally. Usually, however, after propagating silently for a while, it starts doing things like writing cute messages on the terminal or playing strange tricks with the display (some viruses include nice display hacks). Many nasty viruses, written by particularly perversely minded crackers, do irreversible damage, like nuking all the user's files.

 
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