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Is it possible to have willChangeValueForKey / didChangeValueForKey (KVC) notifications for a remote object? For example, I need to have an animation in an NSTableView row on the client, but I want to animate it from the server…

Why don’t you implement the notifications the client-side, and just have whatever methods you implement make corresponding calls on your distant object (the server)? It’s not as automatic, but I think it would work fine.