This new edition provides a comprehensive overview of emerging distributed-systems technologies and has been significantly enhanced and extended into the many new state-of-the-art infrastructures and technologies that have appeared since the successful 1st edition. The focus is also broadened, retaining the technical aspects, but including historical contexts for each of the technologies. The 2nd edition fills in the gaps and includes an additional 13 chapters on new higher popular technologies, including bittorrent, OGSA/WS-RF, workflow technologies, portals and enhanced deployment sections for the new technologies - taking a more applied approach. Further background issues such as state/stateless services and describing various possible communication methods from history and the basic connectivity are also presented. Additional info is available from www.p2pgridbook.com Offering a comprehensive representation of the distributed systems field, this new text offers invaluable insight to both students and researchers.