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# identifier

The unique identifier for a tabbed window group.

```
var identifier: NSWindow.TabbingIdentifier { get }
```

## Discussion

This identifier is shared by all windows that participate in this tab group.

## See Also

[`var tabbingIdentifier: NSWindow.TabbingIdentifier`](/documentation/AppKit/NSWindow/tabbingIdentifier-swift.property)

A value that allows a group of related windows.


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