An electronic device can be coupled to an accessory that controls multiple displays. The device can receive accessory configuration information describing a configuration of the multiple displays. The device can generate one or more user interfaces for display by the multiple displays and transmit the one or more user interfaces to the accessory for display by the multiple displays. The device can receive information indicating user interaction with a user interface. In response to receiving the information, the device can generate an updated user interface and transmit the updated user interface to the accessory.