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Technical 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 Rendezvous networking.

Porting Resources
A guided introduction and learning path for developers new to Mac OS X porting.  
Porting Topics
View the complete Porting Technical Notes List.
Tools and programming interfaces to bring older Macintosh applications to Carbon and to adapt Carbon applications to new technologies.   Low-level porting information related to Darwin (the open source foundation of Mac OS X, based on 4.4BSD UNIX).  

View legacy technologies, including technologies, features, products, APIs, and programming techniques that are no longer supported or have been superseded.