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A directory user agent (DUA) is a type of software user agent that accesses a directory on behalf of the user agent within an X.500 communication network or environment. It is used in the X.500 messaging system to communicate user queries with the directory.
A directory user agent primarily serves as an intermediate client between the end user or software element and the X.500 directory. Typically, the DUA connects and communicates with the X.500 directory for receiving and managing directory data for the configured user or software. DUA can access a directory for a standard user or for another software element. In addition to X.500, the DUA is also used in various client/server computing environments for managing directory services of users.