ents a prototype system, called UbiCon system. By abstracting media streams into generic CONTENT entities, the system provides a simple and powerful means for services to operate media stream. The CONTENT is dynamically created by the system at runtime, and essentially has local association with related services. As a result, the CONTENT is also used as a loosely coupling method for cooperating associated services. acting services with a T model, the services can effectively cooperate together with other services. As a result, a collection of sophisticated applications can be built with this simple and effective services model.