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The success of Internet telephony services like Skype illustrates the feasibility of utilizing unstructured Peer-to-Peer (P2P) networks as an economical platform for supporting group communication applications. However, the ad-hoc nature of these networks poses significant challenges to the efficiency and scalability of the group communication services. This paper presents the design and implementation of GroupCast - a utility-aware middleware architecture for scalable and efficient P2P group communications.
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