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() and remove them with WaitIO().

    if (!(CheckIO(GameIO)))
        {
        AbortIO(GameIO);  /* Ask device to abort request, if pending */
        }
    WaitIO((GameIO);   /* Wait for abort, then clean up */
    CloseDevice(GameIO);

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