Broadband Satellite Communication Systems and the Challenges of Mobility : IFIP TC6 Workshops on Broadband Satellite Communication Systems and Challenges of Mobility, World Computer Congress August 22-27, 2004, Toulouse, France - Thierry Gayraud, Michel Mazzella, Fernando Boavida, Edmundo Monteiro, João Orvalho ((IFIP Advances in Information and Communication Technology))