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Leopard Reference Library: 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 Programming Guide (HTML) (PDF)
Explains how to author, package, and display user help content in Mac OS X.
Guides 2007-10-31
Online Help (HTML) (PDF)
Explains how to add help to a Cocoa application.
Guides 2006-06-28
Providing Help Tags in Carbon (HTML) (PDF)
Explains how to add contextually sensitive help content to an application's user interface.
Guides 2002-07-01
NSHelpManager Class Reference (HTML) (PDF)
Describes an application-level help system.
Reference 2009-02-04
NSAlert Class Reference (HTML) (PDF)
Describes a window that displays a message and obtains the user's response to it.
Reference 2007-04-25
Apple Help Reference (HTML) (PDF)
Describes the C API for finding and displaying help content using Apple's HTML-based help system.
Reference 2006-07-12
Carbon Help Manager Reference (HTML) (PDF)
Describes the interface for displaying short onscreen hints in help tags.
Reference 2004-03-01
Where should I install my help book, and how does Help Viewer locate it? (HTML)
QA1022: Describes how to set up your application to work with Apple's Help Viewer.
Technical Q&As 2001-04-09
Displaying Help (HTML)
QA1006: Discusses how an application can ask the Help Viewer to display help about a particular topic.
Technical Q&As 2001-02-21