rAWfOX, anything/everything that uses shared memory (or ioftpd's tcl calls) for access should work. Other type of access hasn't been suggested since b5.
ZodMan, it shouldn't spam the database too often (only on lock & unlock requests.. since io does the caching for read purposes) I can't see any way to prevent that from occuring (you could add counter, which is incremented by one after each update, to each user & group - and only retrieve data, if counter value has changed)
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