BUSY
From 4Dimensions
BUSY
Usage: busy + reason
Sometimes you are behind your computer but it might take some time before
you can reply or you don't want to be disturbed. In that case you can let the
others know that you are busy by typing BUSY (followed with a reason if you
want to.), this will send a message to the room you are in and it sets the
flag BUSY at your name in the WHO-list. You will still hear the other
channels and you still will be able to receive tells. To remove the BUSY-flag
type BUSY again.
See also: AFK