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* What are IRC client for emacs?

See: http://www.emacswiki.org/emacs/InternetRelayChat.

 * erc, see:
   http://www.emacswiki.org/emacs/ERC

 * ZenIRC, see:
   http://www.emacswiki.org/emacs/ZenIRC

* How register on freenode?

Go to http://freenode.net/faq.shtml#nicksetup.