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Release Notes
Apple provides tools and programming interfaces to help move code to Mac OS X, where developers can take advantage of advanced features such as the Aqua user interface, the Quartz graphics system, and Bonjour networking.
A guided introduction and learning path for developers new to Mac OS X porting.   Essential information for developers porting applications to Mac OS X.  
Porting Topics
View the complete Porting Release Notes List.
Darwin
Guidance for adapting low-level code and drivers to the Darwin platform. 		 
Tools
Techniques for porting applications to Mac OS X with the Mac OS X developer tools.