Yes, my needs are similar. Ive discussed this capabaility with Jim Fulton before, and he argues that this type of history should be retained at application level, not in the ZODB. I think this capability will be useful

If he is willing to state catagoricly that they are not interested in using the zodb is this way, then it should be built into the application or product. I just wanted to verify that I wasn't overlooking some built-in feature- re-inventing the wheel and all that.

Supporting a longer-than-normal history for undo means retaining extra revisions of other objects that happen to be modified in the same transaction. I dont think you or I need that. Right?

Correct. -- Toby Dickenson http://www.geminidataloggers.com/people/tdickenson