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We discuss the architectural and management support for real time data stream applications, both in terms of lower level messaging and higher level service, filter and session structures. In our approach, messaging systems act as a Grid substrate that can provide qualities of service to various streaming applications ranging from audio-video collaboration to sensor grids. The messaging substrate is composed of distributed, hierarchically arranged message brokers that form networks. We discussdoi:10.1002/cpe.1090 fatcat:ojo56vzbjfhkngas4qyyvbg2pm