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Growing demand for use of Internet/Web-based services in real-time distributed virtual simulation (RT-DVS) and other real-time applications is fueling extensive interest in overlay multicast protocols. These applications demand Quality of Service (QoS) and many-to-many multicast services that are not available in underlying Internet services today. This paper describes an early implementation of an overlay multicast protocol designed to support many-to-many multicast for RT-DVS applications called Extensible Modeling and Simulation Framework Overlay Multicast (XOM). We first describe the architecture and key design considerations of XOM. We then provide preliminary results from lab experiments with our prototype. Our results indicate that we can achieve performance objectives for support of web-based services for RT-DVS.