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FONT_UNDER()
   Sets three attributes for a font's underline.

   Syntax
         nOk = FONT_UNDER(nHandle,nLocation,nThickness,nColor)

   Arguments
         nHandle     Defines the font being used. Any integer in the range
                     of 0-31.
         nLocation   Sets the offset relative to a predefined position.
                     A positive value lowers the line.
         nThickness  Sets the pixel thickness of the underline.
         nColor      Sets the underline color.

   Returns
         nOk = FONT_UNDER(nHandle,@nLocation,@nThickness,@nColor)
         nOk         Returns a -1 if an error occurred.

   Description
         FONT_UNDER() sets three attributes for a font's underline. nLocation
         is an offset relative to its pre-defined position. A positive value
         causes the underline to be drawn lower than the original setting.
         nThickness specifies the number of lines that form the underline.
         nColor is the underline's color. The top row of the underline is
         always at nLocation. If the variables nLocation, nThickness, and
         nColor are passed in by reference then the current underline
         settings will be stored in those variables.