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     The setviewport subroutine redefines the graphics viewport. The
     setviewport subroutine 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 upper-
     left and lower-right corners of the rectangular clipping region.
     Any window transformation done with the setwindow subroutine
     applies only to the viewport and not to the entire screen.
 
     See also: ◄Graphic Coordinate Systems►
 
     Return Value
 
     None.
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