rc (ULONG) - returns

      Return codes indicating success or type of failure:

      MMIO_SUCCESS

        If the function succeeds, 0 is returned.
      MMIO_ERROR
        The function failed for a reason different from any of the following returns in this list.
      MMIOERR_INVALID_PARAMETER
        An invalid parameter was passed.
      MMIOERR_INTERNAL_SYSTEM
        An internal system error was found.
      MMIOERR_NO_CORE
        Unable to allocate enough memory for the MMPMMMIO.INI data.
      MMIOERR_INI_OPEN
        Unable to open the MMPMMMIO.INI file.
      MMIOERR_INVALID_DLLNAME
        Unable to validate the DLL name.
      MMIOERR_INVALID_PROCEDURENAME
        Unable to validate the procedure name.
      MMIOERR_MATCH_NOT_FOUND
        Unable to find the I/O procedure to satisfy the input criteria.

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