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Dialogue systems are human-computer interfaces where interaction is modelled on natural language conversations between humans. Dialogue systems can be speech-based, text-based, or multimodal (e.g. speech plus graphics), and are used in simple applications (such as booking cinema tickets) as well as much more complex research systems (e.g. collaboration with robots, tutorial dialogue systems).
There is a wikipedia article at on Dialogue Systems at: http://en.wikipedia.org/wiki/Dialogue_systems
A recent EC project on dialogue systems is the TALK project http://www.talk-project.org
--Olemon 07:40, 11 December 2006 (EST)