NWPA is a producer of this event. This is a non-consumable event that notifies that the instance unload is complete. The shortEventData field of the EventBlockStruct structure contains the following information:
LONG HIN
LONG reasonCode(0=Successful,
1 = General_Failure,
2 = Device_In_Use,
3 = Unload_Not_Supported)
LONG original_ProducerID
LONG eventID (from PhysicalDeviceUnload event)