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The Central Computing Services Office (CCSO) of the University of Illinois at Urbana Champaign created and freely distributed a directory system that was used by many organizations in the 1990s. The system records information about people such as their address, phone number, email, academic information or any other details it was configured to. Nowadays this system is not widely used.

The system consists of two parts: a database server traditionally called ‘qi’ and a command-line client called ‘ph’.

The original command-line ‘ph’ client that came with the ‘ph/qi’ distribution provided additional features that are not implemented in EUDC, like the possibility to communicate with the server in login-mode, which made it possible to change records in the database.