SetPixel()

         Draws a point in graphic mode

    Syntax:

         SetPixel( nCol, nRow, nColor ) -> Nil

         nCol    : The column where to place the point.
         nRow    : The row where to place the point.
         nColor  : The colour. It must be a numeric value.

    Description:

         It draws a point on the screen at the coordinates and colours
         specified.

    Return:

         Nothing.

    Example:

         nModo := SetVGA()
         SetPixel ( 330, 240, 2 )
         Inkey(0)
         TxtMode()