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        viewable
      
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        A window is viewable if it and all of its ancestors are 
        mapped. This does not imply that any portion of the window is 
        actually visible. Graphics requests can be performed on a window when 
        it is not viewable, but output will not be retained unless the server 
        is maintaining backing store.
      
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        visible
      
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        A region of a window is visible if someone looking at the 
        screen can actually see it; that is, the window is viewable and the 
        region is not occluded by any other window.
    
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    © 1988, 1989 Texas Instruments 
    Incorporated
    
    Conversion to HTML made by 
    Gilbert Baumann.
    
    Last build: Tue Dec 16 23:30:42 1997