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When I sat down to write this book, I imagined that I was guiding a friend through activities that would help him understand Cocoa programming. This book acts as the guide through these activities. Often, I will ask you to do something and explain the details or theory afterward. If you are confused, read a little more. Usually the help you seek will be only a paragraph or two away.
If you are still stumped, you can get help on the Web site for this book. (http://www.bignerdranch.com/products/). Errata, hints, and examples are listed there as well. Also, all the solutions for the exercises can be downloaded from there.