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	Username    The ID used when logging onto a computer Virus A computer program that enters a system by a legitimate program, reproduces itself and then performs an action, harmless or otherwise. WAN Wide Area Network, as distinct from a LAN (Local Area Network) this is a network of computers and devices connected via a server, or many servers over a wide geographical network, connected together using a combination of private and public telecom connections. Corporate banks, large retail establishments make wide use of this type of network allowing their operations in many different locations to be linked together in a common Mis environment www World Wide Web. A hypertext-based system of presenting information on the Internet.