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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _setwindow function defines a window viewport. The arguments
     (<wx1>, <wy1>) specify the upper-left corner of the window, and
     the arguments (<wx2>, <wy2>) specify the lower-right corner of the
     window.
 
     The <finvert> argument specifies the direction of the coordinates.
     If <finvert> is TRUE, the y axis increases from the screen bottom
     to the screen top (Cartesian coordinates). If <finvert> is FALSE,
     the y axis increases from the screen top to the screen bottom
     (screen coordinates).
 
     Any window transformation done with the _setwindow function
     applies only to the viewport and not to the entire screen.
 
     If <wx1> equals <wx2> or <wy1> equals <wy2>, the function fails.
 
     Note that this function only affects output functions suffixed
     with _w or _wxy.
 
     See also: ◄Graphic Coordinate Systems►
 
     Return Value
 
     The function returns a nonzero value if successful. If the
     function fails (e.g., if it is not in a graphics mode), it
     returns 0.
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