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# Constants

Constants for use with multiple classes.

## Topics

### Constants

[`var NSIMAGE_UNAVAILABLE_MACCATALYST: Int32`](/documentation/AppKit/NSIMAGE_UNAVAILABLE_MACCATALYST)

[`var NS_USER_ACTIVITY_SUPPORTED: Int32`](/documentation/AppKit/NS_USER_ACTIVITY_SUPPORTED)

### Exceptions

[Exceptions](/documentation/AppKit/exceptions)

Constants AppKit uses to name exceptions.


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