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Wikipedia definition
1. User agentIn computing, a user agent is software that is acting on behalf of a user. For example, an email reader is a Mail User Agent, and in the Session Initiation Protocol (SIP), the term user agent refers to both end points of a communications session. In many cases, a user agent acts as a client in a network protocol used in communications within a client–server distributed computing system.
Read “User agent” on English Wikipedia
Read “ユーザーエージェント” on Japanese Wikipedia
Read “User agent” on DBpedia

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