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     The _setcliprgn function limits the display of subsequent graphics
     output and font text output to an area of the screen known as the
     "clipping region." The physical points (x1, y1) and (x2, y2) are
     the diagonally opposed sides of a rectangle that defines the
     clipping region.
 
     This function does not change the view coordinate system. It
     merely masks the screen.
 
     Note that the _setcliprgn function affects graphics and font
     text output only. To mask the screen for text output, use the
     _settextwindow function.
 
     See also: ◄Graphic Coordinate Systems►
 
     Return Value
 
     None.
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