Abstract
Over the past year we have been designing and constructing an experimental decentralized information system called Violet. The lowest levels of the Violet system make it easy to construct a distributed user application by hiding the application's decentralized environment. Violet's first application, a calendar system, provides a sophisticated user interface to a simple relational data base manager. This paper presents our experience with the design and implementation of Violet. We discuss a new algorithm for replicated data which is implemented by Violet, and discoveries we have made about desirable concurrency modes for shared files. The conclusion outlines what we consider to be desirable design features for decentralized information systems.
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