Internet Relay Chat
•The channel operator can change the channel’s topic and heading at any time, determines which users may participate in the channel, and can change whether the channel is public or private.
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•Participants select nicknames when they log on to an IRC server.  Nicknames must be unique.
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•A channel operator’s nickname is preceded by @.
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•IRC servers run automated programs, called IRC robots or bots, which perform routine services on the IRC network.