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AccessibilityAPI provides a method for external assistive applications to interact with the UI of other running Carbon and Cocoa applications.

Accessibility Guides:

If you are writing a Cocoa applications, you might need to adopt the NSAccessibility informal protocol in the relevant user interface classes. If you are writing an assistive application, take a look at and

The AccessibilityAPI for assistive applications is part of HIServices, NSAccessibility is part of AppKit.