Mac OS X Developer Library
Overview of new API and features in Mac OS X Lion.
Fundamental information about the Mac OS X environment and how your applications interact with that environment, and tips for designing key parts of your application.
Detailed API diffs from Snow Leopard to Lion, with links to available reference documentation, if you need to know the specific symbols that changed in a given framework.
This tutorial shows how to create a simple application for Mac OS X and introduces essential aspects of the development process.
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