int GetSystemInfo (SYSTEM_INFO *sinfo)
{
    sinfo->num_displays = _getNumDisplays();
    sinfo->num_printers = _getNumPrinters();
    sinfo->num_drives =   _getNumDrives();
    if (sinfo->size == sizeof (oSYSTEM_INFO))
    {
          /* don't touch extended fields */
    }
    if (sinfo->size == sizeof (SYSTEM_INFO))
    {
          /* fill extended fields */
          sinfo->num_tapes =    _getNumTapes();
    }
    return 0;
}


