# AVSystemRoute.LaunchMode.application Launches the corresponding application on the remote device. ``` case application ``` ## Discussion Use this mode when you want to start your app’s counterpart on the remote device, enabling app-to-application communication and custom playback experiences. The remote application can handle the provided URL and maintain bidirectional communication through the [`AVSystemRoute.DataChannel`](/documentation/AVSystemRouting/AVSystemRoute-5s2um/DataChannel) returned by [`start()`](/documentation/AVSystemRouting/AVSystemRouteSession-gp78/start()). Application identifiers must be configured in the `MDESupportedProtocols` key in your app’s `Info.plist` file. For example: ```xml MDESupportedProtocols com.example.sharingprotocol com.example.myapplicationidentifier ``` > Important: If `MDESupportedProtocols` is not set, calls to > ``doc://com.apple.avsystemrouting/documentation/AVSystemRouting/AVSystemRouteSession-gp78/start()`` fail. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)