Mobile agents are concerned with self-contained and identifiable computer programs that can move within a network and can act on behalf of the user and another entity. To reduce information overload and to efficiently use network resources, most current research work on the mobile agent paradigm has two general goals: the reduction of network traffic and asynchronous interaction,. The international contributors to this book provide an overview of how the mobile code can be used in networking with the aim of developing further intelligent information retrieval, network and mobility management and network services.