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Leopard Release Notes
Mac OS X combines an open source, UNIX-based core with such features as the Aqua user interface, the Quartz graphics system, and rich application-development frameworks. The documents here provide an overview of the concepts and technical capabilities of Mac OS X most relevant to developers, and are focused on Mac OS X as a whole.

A guided introduction and learning path for developers new to Mac OS X.   Essential information about Apple's Mac OS X operating system.  
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Dynamic Loader Release Notes (HTML)
Updated for Mac OS X v10.5.
General 2009-03-04
What's New In Mac OS X (HTML) (PDF)
Summarizes new Mac OS X technologies.
General 2007-12-11
Stack Execution Release Notes (HTML)
General 2007-07-17