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# XPC_ACTIVITY_CHECK_IN

A constant to check in with the system for a previously registered activity using the same identifier.

```
let XPC_ACTIVITY_CHECK_IN: xpc_object_t
```

## Discussion

Pass this constant to [`xpc_activity_register(_:_:_:)`](/documentation/XPC/xpc_activity_register(_:_:_:)) as the criteria dictionary to check in with the system for previously registered activity using the same identifier (for example, an activity from a launchd property list).

---

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