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LAN
Local Area Network. A LAN allows users to share files between computers, send e-mail and access the Internet. Most companies use Local Area Networks so that users can access information within or outside the LAN.
leased line
A leased line is a dedicated line that connects a user or network to another network or an ISP.
Listserv
An automated mailing list distribution system.
lurking
Lurking involves simply listening or watching and not participating on an IRC channel, a mailing list, or some other type of Internet connection.