IRC [pronunciation at http://www.bartleby.com/61/86/I0228650.html] - Short for Internet Relay Chat, a chat system developed by Jarkko Oikarinen in Finland in the late 1980s. IRC has become very popular as more people get connected to the Internet because it enables people connected anywhere on the Internet to join in live discussions.
To join an IRC discussion, you need an IRC client and Internet access. The IRC client is a program that runs on your computer and sends and receives messages to and from an IRC server. The IRC server, in turn, is responsible for making sure that all messages are broadcast to everyone participating in a discussion. There can be many discussions going on at once; each one is assigned a unique channel.
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http://www.pcwebopaedia.com/TERM/I/IRC.html ; http://www.bartleby.com/61/86/I0228650.html