There is currently considerable interest in developing multimedia applications in open distributed systems. However, it is now be- coming clear that existing architectures for open distributed sys- tems do not support the particular requirements of continuous me- dia types such as digital audio and video. This is particularly the case in the important areas of quality of service support and real- time synchronization. This paper presents results from the Sumo project which aims at supporting continuous media types within the framework defined by the draft Open Distributed Processing standard. The paper advocates the use of synchronous languages within this framework for specifying and implementing real-time synchronization and QoS monitoring. A computational model and the realization of an infrastructure supporting this view are pre- sented.