NOTICE <nick|channel> :message

NOTICE will send a notice message to the
user or channel specified.

NOTICE supports the following prefixes for sending
messages to specific clients in a channel:

@ - channel operators only
% - channel operators and half-ops
+ - operators, half-ops, and voiced users

The nick can be extended to fit into the following
syntax:

username@servername

This syntax is used to securely send a notice to a
service or a bot.
