!pnpevent
The !pnpevent extension displays the Plug and Play device event queue.
dbgcmd
!pnpevent [DeviceEvent]
DeviceEvent
Specifies the address of a device event to display. If this is zero or omitted, the tree of all device events in the queue is displayed.
Kdexts.dll
See Plug and Play Debugging for applications of this extension command. For information about Plug and Play drivers, see the Windows Driver Kit (WDK) documentation.