A single frame type] Reduces the number of concepts. Frames unify into a single construct what are often distinct levels in traditional computing environments. For example, the functions of a "desktop," directories, files, clipboards, menu bars and pull-down/pop-up menus are all provided by frames. This unification simplifies the user's conceptual model considerably, and eliminates the need for many commands (e.g., commands for manipulating directories).
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