Active Networks : First International Working Conference IWAN’99 Berlin Germany June 30 July 2 1999. Proceedings This book constitutes the refereed proceedings of the First International Workshop on Active Networks IWAN99 held in Berlin Germany in June July 1999.The 30 revised full papers presented were carefully reviewed and selected from a total of 80 submissions. The book is divided in sections on networks architectures platforms active management and control and security. All in all this book provides a unique state of the art account of architectural aspects technologies and prototype systems that will impact the way future networked businesses will be created and managed