Comet allows web requests to be pushed from server to browser, but similar to its closely related technique AJAX, Comet requires you to incorporate new approaches to make it work. This post by Carol McDonald and Rick Palkovic provides step by step instructions on creating a Comet enabled application. Shedding light on the ABC's behind Comet, which include: RESTfull Web Services, Bayeux, Grizzly framework and Continuations. Read Carol's and Rick's post on RESTful Web Services and Comet http://developers.sun.com/appserver/reference/techart/cometslideshow.html