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The GUI layer, AppKit, provides all you would expect from a GUI toolkit—classes for creating windows, widgets, etc., as well as an event loop for managing user interaction.

Nothing calling itself an "application kit" would be complete without a simple mechanism for creating document-driven applications. OpenStep’s NSDocument and related classes make it very easy to create such applications by overriding a small number of methods.

Since OpenStep was built around a PostScript display model, the concept of WYSIWYG is built into the toolkit. Anything that can be displayed can also be printed.

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