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Chapter 1. Moving Up To Mac Os X > Mac OS X Components

Mac OS X Components

Mac OS X is said to be built in layers. Over the past few years, Apple has illustrated these layers in several different ways; Figures 1 and 2 show two of them. This layered approach limits software access to programming code; each layer can only access the code of the layer immediately beneath it. (The only exception is Classic, which can access all layers.) This enables Apple and third-party developers to create complex yet stable software that does not require intimate knowledge of all workings of the underlying operating system.

Figure 1. A basic representation of the layers of Mac OS X.



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