QUIPU was an ISODE had a full X.500 and LDAP directory.

QUIPU implemented a DSA and a Directory User Agent (DUA) called DISH. X.500 was considered too heavyweight to access directories, Colin Robbins implemented a proprietary protocol to solve the problem, this was then significantly re-worked by Tim Howes for DIXIE which led to the development of the Lightweight Directory Access Protocol.

QUIPU was designed by Kille and the lead engineer was Robbins, largely funded by the INCA project, and used extensively in the Paradise academic X.500 directory pilot.

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