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This paper presents the design of an MPEG-4 multicast streaming system. The signalling and delivery layer of this system conforms to the recommendations made by Part 6 of the MPEG-4 standard - the Delivery Multimedia Integration Framework (DMIF). We present the issues involved in designing our multicast streaming server and client taking into account the levels of abstraction required. The system enables multi-client transparent media streaming across the Internet through its data and control planes. This is done through extending the DMIF layer to provide multicast group functionality and signalling.