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 ScreenToClient()       Converts screens coordinates in Client coordinates
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   Syntax:              ScreenToClient( <hWnd>, <aPoint> )  --> nil

                        This function converts the screen coordinates of a
                        given point on the screen to client coordinates.

   Parameters:

   <hWnd>               Is the handle of the window whose client area is
                        used for the conversion.

   <aPoint>             An array of two elements that holds the
                        coordinates of the point. The two elements of this
                        array are transformed acordingly with the new
                        calculated values.

   Returns:             Nothing. The result is placed inside the same array.

   Sample:              local aPoint := { 100, 120 }

                        ScreenToClient( oWnd:hWnd, aPoint )

                        ? aPoint[ 1 ]
                        ? aPoint[ 2 ]

   Source code:         SOURCE\\WINAPI\\Clt2Scr.c

   See also:            ClientToScreen()