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Each OpenDevice() must eventually be matched by a call to CloseDevice().
When the last close is performed, the device will deallocate all resources
and buffers.  The latest parameter settings will be saved for the next

All I/O requests must be complete before CloseDevice().  If any requests
are still pending, abort them with AbortIO():

   if (!(CheckIO(ParallelIO)))
       AbortIO(ParallelIO);  /* Ask device to abort request, if pending */
   WaitIO(ParallelIO);       /* Wait for abort, then clean up */
   CloseDevice((struct IORequest *)ParallelIO);

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