& @opay
 
  @opay <object> = <message>
  Attribute: Opay
 
  Sets the message (prefixed by the player's name) that is shown to
  others in the room when someone pays <object> enough to satisfy 
  its Cost attribute.
 
  This attribute is only meaningful for players and things, and will
  never be automatically triggered on other object types.
 
  Example: 
  @opay Coke machine = slips some change into the coin slot on the
  Coke machine.  You hear some rumbling from inside the machine and a 
  can of Coke appears in the tray at the bottom of the machine.
 
  See also: give, @cost, @apay, @pay