rc (ULONG)

      Return codes indicating success or failure:

      MMIO_SUCCESS

        The file is in streaming mode.
      MMIOERR_UNSUPPORTED_MESSAGE
        IOProc does not support this message.
      MMIOERR_QOSUNAVAILABLE
        Quality of service is unavailable.
      MMIO_ERROR
        Streaming was unsuccessful due to other errors.

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