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 InvertRect()           Inverts the colors of a window rectangle
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   Syntax:              InvertRect( <hDC>, <aRect> )  --> nil


   Parameters:

   <hDC>                Identifies the window device context.

   <aRect>              Identifies the rectangle to be inverted:
                        { nTop, nLeft, nBottom, nRight }

   Returns:             nil.

   Observations:        This function inverts the colors of a window
                        rectangle. Basically if performs an xOR operation
                        over the colors. Thus, inverting twice a region
                        will restore the original region colors.

   Source code:         SOURCE\\WINAPI\\Rects.c

   See also:            FillRect()