To A Channel

RFC 2810: Internet Relay Chat: Architecture
5.2.1 To A Channel


   In IRC the channel has a role equivalent to that of the multicast
   group; their existence is dynamic and the actual conversation carried
   out on a channel MUST only be sent to servers which are supporting
   users on a given channel.  Moreover, the message SHALL only be sent
   once to every local link as each server is responsible to fan the
   original message to ensure that it will reach all the recipients.

   The following examples all refer to Figure 2.

   Example 4: Any channel with 1 client in it. Messages to the channel
       go to the server and then nowhere else.

   Example 5: 2 clients in a channel. All messages traverse a path as if
       they were private messages between the two clients outside a
       channel.
   Example 6: Clients 1, 2 and 3 in a channel.  All messages to the
       channel are sent to all clients and only those servers which must
       be traversed by the message if it were a private message to a
       single client.  If client 1 sends a message, it goes back to
       client 2 and then via server B to client 3.




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