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DRV_CLOSE
Directs the driver to close the given instance. If no other instances are
open, the driver should prepare for subsequent release from memory.
Parameters
dwDriverId
Identifier of the installable driver. This is the same value previously
returned by the driver from the DRV_OPEN message.
hdrvr
Handle of the installable driver instance.
lParam1
32-bit value specified as the lParam1 parameter in a call to the DriverClose function.
lParam2
32-bit value specified as the lParam2 parameter in a call to the DriverClose function.
Return Value
Returns nonzero if successful or zero otherwise.
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