Outxy()

         Writes a string on the screen in all modes

    Syntax:

         Outxy( nX, nY, cString, nColor ) -> Nil

         nX      : Coordinate X
         nY      : Coordinate Y
         cString : The string to be written
         nColor  : The color of characters

    Description:

         It writes a string in graphic mode. The functions work in all
         CGA, Herc, EGA, VGA and SVGA modes.

    Return:

         Nothing.

    Example:

         DispStr ( 20, 10, "Write in graphic mode", 10 )