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    1. COEverything I have read tells me that File's Owner, First Responder and Application are all proxy objects. The rest are called Top-Level objects. The window with the icons I was referring to is called the Nib document window. As I stated in my question, I have read through quite a few resources. I'm "a little" lost because I have been able to make some very simple single window applications. Nothing all that fancy. I start having issues when it comes to knowing how much to put in a single XIB. The user guides tell you what everything is, but not best practices.
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    2. COAlso, apparently, posts here remove some formatting. I had the paragraph about what resources I had looked at separated by lines. Apparently, this site doesn't like Carriage Returns in posts. At least single CR's.
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    3. COApplication's a bit different in that it always gets hooked up to the app object. First Responder is not exclusively an IB concept, it is delivering messages to the responder chain. (If you don't understand how that works, read about it.) Anyway, one window and one or more controller per XIB is usual. You're trading off the time to unpack the objects for memory usage. Again, poke around some real apps to develop your tastes. If you've got comments about the lack of support for formatting in comments (I agree with you), click on the "feedback always welcome" link at the bottom of the page.
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