Systems and techniques are described for remoting application user interfaces. One of the described techniques includes initiating a remote session with a first user device that allows user interfaces generated by an application to be presented on the first user device and user events associated with the presented user interfaces to be provided as input to the application; and during the remote session with the first user device: receiving a request to initiate a multimedia streaming session between the first user device and a different system through the application; establishing the multimedia streaming session with the different system; and providing the streaming session parameters to the first user device for use by the first user device in establishing a connection between the first user device and the different system and streaming multimedia content over the connection.