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)