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# defaultConnection

Returns the default `NSConnection` object for the current thread.

```
+ (NSConnection *) defaultConnection;
```

## Return Value

The default `NSConnection` object for the current thread, creating it if necessary.

## Discussion

The default `NSConnection` object uses a single `NSPort` object for both receiving and sending and is useful only for vending an object; use the [`rootObject`](/documentation/Foundation/NSConnection/rootObject-c.property) and [`registerName:`](/documentation/Foundation/NSConnection/registerName:) methods to do this.

### Special Considerations

The singleton method of `NSConnection` has been deprecated. It was difficult to ensure that the shared connection wasn’t being used by other operations on the thread on which the default connection was requested. Using `[NSConnection new]` ensures that you get a unique connection object, preventing such collisions.

## See Also

  [Distributed Objects Programming Topics](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/DistrObjects/DistrObjects.html#//apple_ref/doc/uid/10000102i)


---

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