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## 1 Overview

EUDC, the Emacs Unified Directory Client, provides a common user interface to access directory servers using different directory protocols.

Currently supported back-ends are:

- LDAP, Lightweight Directory Access Protocol
- CCSO PH/QI
- BBDB, Big Brother's Insidious Database

The main features of the EUDC interface are:

- Queries using a customizable form
- Inline query expansion (for instance you can expand a name to an email address in a mail message buffer using a server as an address book)
- Multiple servers can be tried in turn until a match is found for an inline query
- Fast minibuffer queries for email addresses and phone numbers
- Interface to BBDB to let you insert server records into your own BBDB database (see BBDB)