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BUTTON_HOT()
   Determines if the coordinates fall within the defined button.

   Syntax
         nButtonNumber = BUTTON_HOT(nX,nY)

   Arguments
         nX          Sets the horizontal coordinate of the point.
         nY          Sets the vertical coordinate of the point.

   Returns
         nButtonNumber Returns the button number of the found button or 0 if
                       none found.

   Description
         BUTTON_HOT() checks to see if the specified coordinates fall within a
         currently active button. If the point is within a button, the
         function returns the button number. Otherwise, a 0 is returned.