Anonymous Flag

RFC 2811: Internet Relay Chat: Channel management
4.2.1 Anonymous Flag


   The channel flag 'a' defines an anonymous channel.  This means that
   when a message sent to the channel is sent by the server to users,
   and the origin is a user, then it MUST be masked.  To mask the
   message, the origin is changed to "anonymous!anonymous@anonymous."
   (e.g., a user with the nickname "anonymous", the username "anonymous"
   and from a host called "anonymous.").  Because of this, servers MUST
   forbid users from using the nickname "anonymous".  Servers MUST also
   NOT send QUIT messages for users leaving such channels to the other
   channel members but generate a PART message instead.

   On channels with the character '&' as prefix, this flag MAY be
   toggled by channel operators, but on channels with the character '!'
   as prefix, this flag can be set (but SHALL NOT be unset) by the
   "channel creator" only.  This flag MUST NOT be made available on
   other types of channels.

   Replies to the WHOIS, WHO and NAMES commands MUST NOT reveal the
   presence of other users on channels for which the anonymous flag is
   set.




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4.2.1 Anonymous Flag

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