Usage: MESG [y|n]
  MESG functions identically to the Unix "mesg" command.  It allows
  you to selectively allow or disallow incoming "talk" or "write"
  messages.  It takes one of two optional arguments:

    y - allow incoming talks/writes
    n - don't allow incoming talks/writes

  If no argument is specified, the current setting is displayed.

  NOTE: Your "mesg" setting is not reset when you quit from irc.
  If you have changed it at all with MESG, the most recent setting
  is preserved.
