CTCP (Client To Client Protocol) is a way of sending arbitrary data
over an IRC network, which may include bytes not allowed in standard
IRC messages. CTCPs are sent as a PRIVMSG or NOTICE, where the first
and last characters as
\001 (SOH), and special bytes are escaped
by encoding them into a two-byte sequence beginning with
(DLE). CTCPs consist of command name (typically in upper-case)
followed by list of space-separated arguments, which may be empty.
One use of CTCPs supported by the vast majority of IRC clients today
is the ACTION command, typically invoked with /me. For example, if
foo in the channel
#bar were to issue
everyone in the channel would receive the message
:foo PRIVMSG #bar :\001ACTION dances\001
Other common uses of CTCP include requesting the name and version of a user's IRC client, their local time, determining ping times, and initiating file transfers (DCC).
Characters are escaped as follows:
All other appearences of the escape character are errors, and are dropped.
See http://www.irchelp.org/irchelp/rfc/ctcpspec.html for more details.
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