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Leopard Reference: User Experience
Developers can use two Mac OS X help technologies to provide assistance to users: Apple Help and help tags. Both technologies deliver context-sensitive help and contribute to users' ease of learning.
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Apple Help Reference (HTML) (PDF)
Describes the C API for finding and displaying help content using Apple's HTML-based help system.
 2006-07-12
Carbon Help Manager Reference (HTML) (PDF)
Describes the interface for displaying short onscreen hints in help tags.
 2004-03-01
NSAlert Class Reference (HTML) (PDF)
Describes a window that displays a message and obtains the user's response to it.
 2007-04-25
NSHelpManager Class Reference (HTML) (PDF)
Describes an application-level help system.
 2009-02-04