Mobile agents are an increasingly popular paradigm, and in recent years, there has been a proliferation of mobile agent systems. These systems are, however, largely incompatible with each other. In particular, agents cannot migrate to a host that runs a different mobile-agent system. Prior approaches to interoperability have tried to force agents to use a common API, and so far, none have succeeded. The goal, summarized in the catch phrase Write Once, Move Anywhere, leads to the efforts to develop mechanisms that support dynamic runtime interoperability of mobile-agent systems.
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