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Leopard Guides: Internationalization
Unicode is an international standard character encoding that contains all the characters needed by the world's commonly used writing systems and a great many less commonly used ones. Mac OS X uses Unicode as its native character encoding because it can represent most of the world's languages in a single, industry-standard character set. Developers can take advantage of the support Apple provides for Unicode text rendering and editing, for locale-sensitive operations on Unicode text, and for converting between Unicode and other character encodings.
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ATSUI Programming Guide (HTML) (PDF)
Explains how to lay out, process, and draw Unicode text.
 2007-07-10
Handling Unicode Text Editing With MLTE (HTML) (PDF)
Explains how to use Apple's multilingual text engine.
 2008-10-15
Programming With the Text Encoding Conversion Manager (HTML) (PDF)
Explains character encodings, Unicode conversion, and custom converter plug-ins. Lists encoding variants.
 2005-07-07
Strings Programming Guide for Core Foundation (HTML) (PDF)
Explains how to create, manipulate, and search strings in Core Foundation, and how strings interact with encodings and character sets.
 2008-03-11
Supporting Unicode Input (HTML) (PDF)
Introduces international text in Mac OS X and lists the tasks an application needs to perform.
 2005-07-07