Inside Mac OS X - MacRumors
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Inside Mac OS X

Apple has published a PDF document online entitled "Inside Mac OS X: System Overview":

"Inside Mac OS X: System Overview is intended for anyone who wants to develop software for Mac OS X. But it is also a resource for people who are just curious about Mac OS X as a development and deployment platform.

While aimed at developers, it might be of interest to any hard core Mac user just looking to get a better understanding of how Mac OS X works. [Link to PDF]

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