defer: 
    my-window 
    r 
    ...))
    </pre>

    <p>To specify the window features we want, we must combine
    several flags to form the proper style mask. Cocoa provides named
    constants for each of the various window features. To create the
    syle mask that describes a new window, use inclusive-or to
    combine the named flags into a style mask:</p>

    <pre>
(logior  #$NSTitledWindowMask 
         #$NSClosableWindowMask  
         #$NSMiniaturizableWindowMask 
         #$NSResizableWindowM