Doesn Comet already handle real-time communication over the Web?
Comet is a loose collection of techniques to asynchronously push “real-time” data over the Web. It includes mechanisms and protocols on the server and client side. There are no formal standards for Comet implementations. Comet implementations typically employ a second HTTP connection for bi-directional communication between client and server. The HTML 5 Communications standard, and specifically Web Socket, addresses the shortcomings of Comet for developers and users who have a need for true bi-directional, real-time communication over the Web.