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Each OpenDevice() must eventually be matched by a call to CloseDevice().

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

   AbortIO(PrintIO);  /* Ask device to abort request, if pending */
   WaitIO(PrintIO);   /* Wait for abort, then clean up */

   CloseDevice((struct IORequest *)PrintIO);

   Use AbortIO() / WaitIO() Intelligently.
   Only call AbortIO()/WaitIO() for requests which have already been
   sent to the printer device.  Using the AbortIO()/WaitIO() sequence on
   requests which have not been sent results in a hung condition.

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