The Interop Glossary

An evolving vocabulary for the law of interoperability governing electronic data format and communication protocol technical specifications, standards, and technical regulations.

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u
user agent
In a broad sense, an entity that acts on behalf of the user in a software application process. More narrowly, a client application used with a particular network protocol. Still more narrowly in the W3C recommendations context, an implementation of a specification that retrieves data across a network and processes compound documents.