DispStr()

         Writes a string on the screen

    Syntax:

         DispStr ( cStr, nX, nY, nFore, nBack, nSep ) -> Nil

         cStr  : The string to be written
         nX    : Coordinate X
         nY    : Coordinate Y
         nFore : The colour of characters
         nBack : The colour of the background
         nSep  : Space between characters. Default 8 points

    Description:

         It writes a string in graphic mode. The mode must be EGA or VGA.

    Return:

         Nothing.

    Example:

         DispStr ( "Write in graphic mode", 20, 30, 2, 0, 10 )