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Leopard Guides: User Experience
Mac OS X contains a built-in speech recognition engine that can be used by applications to recognize users' speech. Mac OS X also provides a speech synthesis engine, also called text-to-speech (TTS), that converts text into audible speech. These technologies provide benefits for all users who speak U.S. English, but are particularly useful to users who have difficulty seeing the screen or using the mouse and keyboard.
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Accessibility Overview (HTML) (PDF)
Explains how to use the accessibility features built into Mac OS X.
 2008-03-11
Speech Synthesis Programming Guide (HTML) (PDF)
Describes speech synthesis in Mac OS X and explains how your application can produce customized spoken output.
 2006-09-05