How to sync up the experience for large number of users of a web app?
rmc00: You may want to take a look at comet and long polling. With this method, you can eliminate reliance on a clock (and all the associated headaches).Using comet/long polling, you can sort of mimic pushing the new pictures to clients. This could be ideal because it wouldn't matter when users load the page. Your mileage may vary, however, depending on your specific requirements.