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window-decoration
window <- decoration: window_decorator*
Window displaying me and my decorations. This slot will normally contain an instance of class window_decorator. The window decoration displays a label above the Window and/or adds scrollbars to the window. window->catch_all creates a decorator for methods that are not defined on class window and are defined by class window_decorator. This allows for e.g., 
send(Window, scrollbars, both)
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