Synchronising animation across multiple SWFs

I’ve been asked a few times now to create effects that require multiple instances of the Flash Player on a page to interact and remain in sync – even with interaction. Because of this, using timed events is no good and because of harddrive thrashing (which I won’t do for what might just be some banners) you can’t use Flash cookie updates. Also, when you have more than 2 SWFs, deciding which SWF updates who becomes tricky. I came up with this solution, using LocalConnection with a twist, which works pretty well – but if anyone has a better method, drop it in a comment