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X.500 directory
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... Directory System Agent (DSA)
The software that provides the X.500 Directory Service for a
portion of the directory information base. Generally, each DSA ...
... Directory User Agent (DUA)
The software that accesses the X.500 Directory Service on behalf
of the directory user. The directory user may be a person or
another software element ...
... management and browser
applications that provide read/write interactive access to the
X.500 Directory. See also: X.500.
...