This document discusses Comet, a technique that uses long-lived HTTP connections to allow asynchronous server-client communication and enable real-time updates of web pages. It outlines various Comet techniques like long polling, forever frames, and callback polling. It also discusses technologies that support Comet like Jetty, Twisted Python, and frameworks like DWR, Juggernaut, and Bayeux. The document concludes with a demo of Comet in action and pointers to additional resources.