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This paper highlights the need for sophisticated multicast mechanisms to be provided by transfer protocols to support group communication. This need becomes even more evident in the light of the special QoS requirements imposed by multimedia applications. Today's protocols do not provide the broad range of functionality required by these upcoming applications. From several sample applications we derive functionality and performance requirements that have to be provided by the transfer systems. Taking XTP as an example, we show how some identified demands are met by this protocol. Furthermore, necessary enhancements are suggested. Usefulness of these enhancements is proved by simulation results. Our implementation strategy, based on a high modularization of the protocol software, is illustrated.