Controlling different flash files on the same html page... need help!

Ok… I believe this is possible… but then I could be wrong. I have two separte flash files on the same html page… I want to be able to click a button in one flash file that affects the timeline in a separte flash file on the same page. Is this possible? If so… any recomendation, sites or tutorials that show me how to do this?

Thanks in advance