Persistent Full Duplex Connection via Web Socket

RIA is considered one of the most distinctive features of the modern Web, reflecting a trend where web applications grow to resemble desktop applications. The overwhelming majority of rich web applications are still built on the request-response model. Events on the client side can reach the server, but not vice versa. To build something as simple as a chat, you have to use tricks. These techniques for emulating bi-directional connections are collectively called Comet, a term coined by Alex Russell of Dojo.