---
title: identifier
framework: appkit
role: symbol
role_heading: Instance Property
path: appkit/nswindowtabgroup/identifier
---

# identifier

The unique identifier for a tabbed window group.

## Declaration

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

## Discussion

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

## See Also

### Related Documentation

- [tabbingIdentifier](appkit/nswindow/tabbingidentifier-swift.property.md)