DRV_FREE
Notifies the
driver that it is being removed from memory. The driver should free any memory
and other system resources that it has allocated.
Parameters
hdrvr
Handle of the
installable driver instance.
Return Value
No return
value.
Remarks
The dwDriverId,
lParam1, and lParam2 parameters are not used.
The DRV_FREE
message is always the last message that a device driver receives.