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 InvalidateRect()       Forces a rectangle to be repainted
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   Syntax:              InvalidateRect( <hWnd>, <lRepaint> )  --> nil

                        InvalidateRect( <hWnd>, <aRect>, <lRepaint> ) --> nil

                        This function supports two different formats as
                        above.

   Parameters:

   <hWnd>               The handle of the window whose update region
                        get invalid and should be painted.

   <aRect>              Specifies the dimensions of the rectangle that
                        needs to be updated: { nTop, nLeft, nBottom, nRight }.
                        If not supplied means the whole window area.

   <lRepaint>           Specifies if the window must be painted.

   Returns:             Nil.


   Observations:        This function forces a window region or its whole
                        area to be repainted. Basically it generates a
                        WM_PAINT message.

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