This book constitutes the refereed proceedings of the Second International Conference on Wired/Wireless Internet Communications, WWIC 2004, held in Frankfurt/Oder, Germany, in February 2004.The 26 revised full papers presented were carefully reviewed and selected from around 60 submissions. The papers are organized in topical sections on protocol engineering and energy efficiency in wireless networks; mobility management and mobile devices; transport layer and congestion control; architecture, implementation, and experimentation; network and protocol modeling; wireless network scheduling and analysis; multimedia distribution and group communication; and service discovery.