Networked Group Communication : Third International COST264 Workshop NGC 2001 London UK November 7–9 2001 Proceedings This book constitutes the refereed proceedings of the Third International COST264 Workshop on Networked Group Communication NGC 2001 held in London UK in November 2001. The 14 revised full papers presented were carefully reviewed and selected from 40 submissions. All current issues in the area are addressed. The papers are organized in topical sections on application level aspects group management performance topics security and topology