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Coda has application-specific resolvers (ASRs) that can be provided by programmers, Ficus has something of the same sort (though I do believe it is somehow based on filetypes) but they are provided by the system. Bayou applications must specify a conflict resolver, called a merge procedure, for each write/update.
In Bayou conflict detection and conflict resolution can be given for each write/update, whereas in Coda and Ficus conflict detection is performed by the system and conflict resolvers are global . I think that Bayou's solution is much more flexible, but it inevitably leads to more programming, and existing applications cannot be used at all!