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 Defines logical dimensions for the current graphics viewport - for example,
 your own viewport coordinate system. Statement not available when forms are
 showing.
 
    WINDOW [[SCREEN] (x1!,y1!)-(x2!,y2!)]
 
    ■ SCREEN       Inverts the normal Cartesian direction of the y screen
                   coordinates so that y values increase from the top of the
                   screen to the bottom
 
    ■ (x1!,y1!)    Logical coordinates that map to the upper-left screen
                   coordinates of the viewport
 
    ■ (x2!,y2!)    Logical coordinates that map to the lower-right screen
                   coordinates of the viewport
 
 See Also
    ◄CLS Statement►                    ◄PMAP Function►
    ◄POINT Function►                   ◄SCREEN Statement►
    ◄VIEW Statement►                   ◄WIDTH Statement►