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# FxPrincipalAPI

A protocol that provides an interface that the host application implements to retrieve an XPC proxy object for communicating with its XPC.

```
protocol FxPrincipalAPI
```

## Topics

### Getting XPC Proxy Objects

[`servicePrincipal()`](/documentation/professional_video_applications/FxPrincipalAPI/servicePrincipal())

Retrieves a pointer to the proxy object used for sandboxed out-of-process tasks.


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