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Ad-hoc networks enable mobile devices to communicate without any fixed infrastructure. While reliable multicasting has been identified as a key application in this context, we analyze different aspects of ad-hoc networks and their impact on application-layer multicast. As a result, we propose a technique of local broadcast-clustering, making use of the wireless medium's broadcast capability. We further describe a simple congestion control and also a technique for avoiding an overlay's routing inconsistencies and, thus, for stabilizing the delivery of multicast data.