From Tapestries MUCK
@osucc is a command to set the osuccess property to an object. When used successfully, the message of @osucc is what is broadcasted to the room where the object rests. It is most commonly used on actions.
@osucc Door=steps through the door.
The user will see what is in @succ, while the room will see what was in @osucc with the name of the user appended. In the example, Name steps through the door. would be the broadcast message.