Function:   VISETMODE( <expC1> ) --> logical

Synopsis:   Sets a video card to specified Mode

            <expC1>  numeric value ( in HEXADECIMAL notation )
                     representing Mode to set Video card to

            This function is an all around video set function.
            It can set a videocard to ANY mode provided it supports
            it. If You use this function, first of all make sure that
            Your MONITOR supports the new resolution as some are so
            high in their display resolution that they may damage Your
            monitor if they are not supported. The function will accept
            the mode in decimal and convert it to hexdecimal.

            PLEASE REFER TO YOUR MONITOR AND VIDEO CARD MANUAL FOR
            FURTHER INFORMATION IF BOTH SUPPORT THE TYPE OF DISPLAY MODE
            YOU DESIRE TO SELECT!!!

            Watch out for the resolutions only supported by MULTISYNC
            or MULTIFREQUENCY monitors ( they are generally the
            high HEX numbers > 20h )

            However take care in selecting a mode that works fine with
            Your system.

Examples:   VISETMODE( "7" )      && sets VGA videocard to mode 07h

            VISETMODE( "29" )     && sets VGA card with ET4000
                                  && into 800x600 graphics mode

            VISETMODE( "53" )     && sets VGA card with TVGA 8900
                                  && into 132x25 textmode


Returns:    .T. if called successfully, otherwise .F.