ERC is an Emacs InternetRelayChat client. It provides all features
that users may expect from an IRC client:
    * multi channels / multi servers: every channel is put in a
      separate buffer, also, several IRC servers may be used at the
      same time.
    * queries: private conversation are treated as channels and are
      put into private buffers.
    * highlighting: some occurences of words can be highlighted, thus
      easing conversation tracking (ErcHighlighting)
    * notification: ERC can notify you that users are online
      (ErcNotify)
    * channel tracking: channels can be hidden and conversation
      continue in the background. You are notified when something is
      said in such an hidden channel. (ErcChannelTracking)
    * nick completion: ERC can complete words so as to ease nicknames
      writing. (ErcCompletion)
    * history: past actions are kept in history rings for future
      use. (ErcHistory)
    * multi languages: messages are multilingual and can be
      customized. (ErcCatalog)
    * user scripting: users can load scripts (i.e. auto greeting
      scripts) at ERC startup.

WWW: http://www.emacswiki.org/cgi-bin/wiki.pl/EmacsIRCClient