The script attached to this event fires when a trap has been successfully disarmed. This could be used to award experience points or make it easier to discover other traps of similiar design.
When a trap has been disarmed, always when it is disarmed and sometimes when you recover a trap (see Remarks, below).
GetLastDisarmed() returns the creature or PC object who disarmed the trap.
When used with a trap placed on a door, the OnDisarm event fires both when you disable the trap, and when you recover the trap (in this case the OnDisarm event fires before player acquire the trap item). A standard trap (trigger on the floor) only fires when you disarm, not recover the trap.