command: afk <message>, afk -<time> <message>, afk ?, afk.
Notify other players that you are 'afk' (ie: away from keyboard). When
they 'tell' or 'reply' to you, they will be informed that you are afk.
If you use the second format, they will only be informed that you are
afk if you are idle by more than <time> minutes.
While you have an afk message set, any 'tell' or 'reply' sent to you
will have the current time prepended to it.
Typing 'afk ?' tells you if you have an afk message set.
Typing 'afk' on its own will clear your afk message.
> afk I've gone to make some food.
> afk -10 I'm idle because I am dead.
See also: reply, retell, tell, tells, timezone, told.