NICK

[Han2-Ro]

Command: NICK
Parameters: <nickname> [ <hopcount> ]

NICK message is used to give user a nickname or change the previous
one. The parameter is only used by servers to indicate
how far away a nick is from its home server. A local connection has
a hopcount of 0. If supplied by a client, it must be ignored.

If a NICK message arrives at a server which already knows about an
identical nickname for another client, a nickname collision occurs.
As a result of a nickname collision, all instances of the nickname
are removed from the server's database, and a KILL command is issued
to remove the nickname from all other server's database. If the NICK
message causing the collision was a nickname change, then the
original (old) nick must be removed as well.

If the server recieves an identical NICK from a client which is
directly connected, it may issue an ERR_NICKCOLLISION to the local
client, drop the NICK command, and not generate any kills.

Numeric Replies:

       ERR_NONICKNAMEGIVEN             ERR_ERRONEUSNICKNAME
       ERR_NICKNAMEINUSE               ERR_NICKCOLLISION

Example:

NICK Wiz ; Introducing new nick "Wiz".

:WiZ NICK Kilroy ; WiZ changed his nickname to Kilroy.