LCC (available through URL http://www-sop.inria.fr/planete/software/ ) is a two-level clustered overlay multicast architecture that aims to provide scalable, efficient and robust multicast distribution service to end users. The LCC library provides different useful application-layer functions. However, it is first designed to address topology-aware construction, so focus is set on two major processes : Locating and Clustering , see  . The LCC library is available as open source under the Cecill license. The LCC package also contains several test scripts such as wrappers for vic and rat MBone conferencing applications. A wrapper for vlc is under study.