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In previous chapters of [[Objective-C 2.0 Essentials]] we have covered the concept of object-oriented programming in considerable detail. So far, however, we have focused almost exclusively on the how to create and work with our own classes and objects within Objective-C programs.

The Framework Reference Documentation lists all the classes available and for each class describes in detail what the class does and what methods are available. In the following chapters we will look in detail at how to work with some of these classes.

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