When using Comet, keep in mind that HTTP was not designed to push data from the server to the client. Comet is a hack, even if the details are hidden in Seaside. Luckily the implementation works on all modern web browsers, but there is no guarantee that these tricks will continue to work with the next generation of web browsers. It should be noted that upcoming generations of web browsers will very likely support this type of inverse communication, and there is work on an emerging Comet standard.
Enough ranting, let’s give it a quick try.