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     The _setviewport function redefines the graphics viewport. The
     _setviewport function defines a clipping region in exactly the
     same manner as _setcliprgn, and then sets the view-coordinate
     origin to the upper left corner of the region.
 
     The physical points (<x1>, <y1>) and (<x2>, <y2>) are the
     diagonally opposed corners of the rectangular clipping region. Any
     window transformation done with the _setwindow function applies
     only to the viewport and not to the entire screen.
 
     See also: ◄Graphic Coordinate Systems►
 
     Return Value
 
     None.
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