I'm confused about serving swf's to browsers, and Macromedia doesn't provide much useful info. Specifically, I'd like to publish my movies as ver.4 but I understand that ver. 3 players are still more common than ver. 4. Therefore, I wonder what my options are. I suppose the easiest is to set it up to sniff browers for ver. 4 players, but I'm not at all sure what happens if you have a ver. 2 or 3 player installed. Can you update to ver. 4 quickly and painlessly? The only url that I've looked at from Macromedia instructs browsers to download, decompress, quit the browser, and run the exe., which is ridiculous as far as I'm concerned. If updating to ver. 4 is a minor inconvenience I'll require it of ver. 3 browsers; otherwise I'll have to set up alternative means to serve up a ver. 3 movie. So, can anyone tell me what happens if you hit a ver. 4 movie with a ver. 3 player? Or point me to info? Thanks.