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The self-modifiability or evolvability is necessary for mobile agents to navigate over network changing unpredictably and continuously. We propose an approach to the evolution of mobile agents based on dynamic objects capable of being attached to, interpreted by, carried with, exchanged among, and structured by the agents. We have implemented such objects on the MESSENGERS mobile-agents system, and have coded a distributed task coordination as an application example. This paper presents the implementation and benejts of our approach to the agent evolution

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