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     The setcliprgn subroutine 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 upper-left and lower-right corners of a rectangle that defines
     the clipping region.
 
     This subroutine does not change the view coordinate system. It
     merely masks the screen.
 
     Note that the setcliprgn subroutine 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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