I know of scripts or bots that will send a message to people leaving the room.
That message ends up in the status window.
As far as i know that is done by a /notice.
here is the code:
Code:
 on !+1:PART:#:{
  set %target $nick
  set %place $chan
  /timergreet 1 3 /notice $nick $read $mircdir $+ part.txt
}


Hope this helps smile

Greetzzzz