Revise Forward Request Logic
If a driver cannot complete a request by itself, it passes the request down the stack to the next lower driver. For a WDF driver, the next lower driver is considered the default I/O target and is represented by a WDFIOTARGET object. To get a handle to this object, the driver calls WdfDeviceGetIoTarget.
For information about how a WDF driver passes a request down to the next lower driver in the stack, see Forwarding I/O Requests.
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