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  Arguments
 
    FInvert     Specifies vertical orientation of window
 
    wx1, wy1    Specify the upper-left corner of the window
 
    wx2, wy2    Specify the lower-right corner of the window
 
  Description
 
    The _SetWindow procedure defines a floating-point graphics window
    bounded by the specified coordinates.
 
    _SetWindow's FInvert argument specifies the vertical orientation
    of the window. If FInvert is True, the window is inverted
    vertically and y-axis values increase from screen bottom to top
    (Cartesian coordinates). If FInvert is False, y-axis values
    increase from screen top to bottom (like viewport coordinates).
 
    Any window transformation done with _SetWindow applies only to
    the viewport and not necessarily to the entire screen.
 
    Note:  If wx1 equals wx2 or wy1 equals wy2, the function fails.
    It also fails if the current mode is not a graphics mode.
 
  _GrStatus Returns
 
    _GrInvalidParameter, _GrNotInProperMode, _GrParameterAltered