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18. Now, let's test drive our app within InterfaceBuilder by choosing "Document->Test Interface". This then "runs" our application in an interpreted environment, so you can try out typing text, changing fonts, bringing up the ruler, dragging in graphics and so on. You won't be able to save or open yet, because we need to write that code, compile it, and run the compiled version to see additional functionality over what is already part of the runtime system.
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