A rollicking French dance, accompanied by indecorous or extravagant postures and gestures.

a high-kicking dance of French origin performed by a female chorus line

Cancan is a text-based, interactive utility similar to telnet, but with a number of extensions useful for MUD playing. Another use might be to provide line editing, aliases, etc., for those services that have a simple telnet interface. Cancan features aliases, actions, key bindings, text highlighting, substitutions, and line editing with history and completion.