<nick!user@host>
WALL is an alias for USER +BR (default max 1 day)
This command is for sending a message once to every matching user
on IRC. Be careful using this command. WALL creates a list of
persons received the message (and should not have it once more time)
with H flag set. This list can be displayed using ls +h from the
nick and username@host which the WALL request is queued from.
Removing the headers (H) before WALL request is removed would cause
the message to be sent once more to what users specified in list.
WALL +7 @*.edu Do not do this! - Makes it clear for all users using
IRC on host @*.edu the next 7 days how stupid it is to send such WALL's ;)
This functionality may be restricted to IRC operators.