D'Agents is a general-purpose mobile-agent system that has been used in several informationretrieval applications. In this paper, we rst examine one such application, operational support for military eld personnel, where D'Agents greatly simplies the task of providing ecient, application-speci c access to remote information resources. After describing the application, we discuss the key dierences between D'Agents and most other mobile-agent systems, notably its support for strong mobility and multiple agent languages. Finally, we derive a small, simple application that is representative of many information-retrieval tasks, including those in the example application, and use this application to compare the scalability of mobile agents and traditional client/server approaches. The results conrm and quantify the usefulness of mobile code, and perhaps more importantly, conrm that intuition about when to use mobile code is usually correct. Although signicant additional experiments are needed to fully characterize the complex mobile-agent performance space, the results here help answer the basic question of when mobile agents should be considered at all, particularly for information-retrieval applications. 1
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