In this paper, we survey recent work on peer-to-peer systems, and venture some opinions about future requirements for research. The paper is a survey to support the tutorial at the Networks 2002 Conference and is therefore neither complete, nor likely to be up-to-date by the time you are reading this, since the topic was extremely fast-evolving at the time of writing. Instead, we try to bring some historical perspective and structure to the area, and to shed light on where the novel contributions, and where it is likely that there are research questions to answer.
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