iSysValue (USHORT) - input

      Specifies the system attribute. The possible system attributes are:

      MSV_CLOSEDCAPTION

        Returns TRUE if the user has enabled closed captioning and FALSE otherwise.
      MSV_MASTERVOLUME
        The master volume setting. The range is 0 to 100.
      MSV_HEADPHONES
        Returns TRUE if the user has headphones enabled for the system and FALSE otherwise.
      MSV_SPEAKERS
        Returns TRUE if the user has speakers (line out) enabled for the system and FALSE otherwise.
      MSV_WORKPATH
        Points to a character buffer of size CCHMAXPATH. This is the name of the file-system path where temporary files created by OS/2 multimedia are located (for example, c:\mmos2\temp).
      MSV_SYSQOSVALUE
        System wide Quality of Service (QOS) specification value used for band-width reservation (for example, bytes per second) over the network.
      MSV_SYSQOSERRORFLAG
        Description of error occurring during band-width reservation.

      pValue (PVOID) - in/out

        Pointer to the return field. The type of data object this field points to is dependent on the attribute requested:

          System Attribute

            Data Type
          MSV_CLOSEDCAPTION
            BOOL
          MSV_MASTERVOLUME
            ULONG
          MSV_HEADPHONES
            ULONG
          MSV_SPEAKERS
            ULONG
          MSV_WORKPATH
            PSZ
          MSV_SYSQOSVALUE
            ULONG
          MSV_SYSQOSERRORFLAG
            ULONG

          rc (BOOL) - returns

            If the command completes successfully then MCIERR_SUCCESS is returned, otherwise non-zero is returned.

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