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Date-intensive high performance, high quality digital media traffic cannot be accommodated on traditional layer 3 networks. Alternative technologies to transmit this traffic through the network, such as optical multicast, are being investigated. A prototype of an optical multicast service was showcased during the 7th annual LambdaGrid Workshop celebrated in Prague last September. The prototype used time division multiplexing (TDM) technology as the data plane and user controlled lightpaths (UCLP) as the control/service plane. This paper describes the extensions that were done to the UCLP software to provide the dynamic optical multicast service and shows the results achieved during the Prague demonstration.