Comet Programming: Using Ajax to Simulate Server Push

Comet Programming: Using Ajax to Simulate Server Push: "Comet is a Web application model that enables web servers to send data to the client without having to explicitly request it. Developers can utilize Comet techniques to create event-driven Web apps. Comet is actually an umbrella term for multiple techniques for achieving client-server interaction. All methods have in common that they rely on browser-native technologies such as JavaScript, rather than on proprietary plug-ins. This article will examine one method of implementing Comet called Ajax Long Polling and demonstrate how it can be used to refresh page components and keep cached data in synch with the server."