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     The setwindow function defines a window bounded by the specified
     coordinates. 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 does not affect the output of the font-
     display routine outgtext.
 
     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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