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Comet from JavaOne 2008
Comet allows for bidirectional communication between server and client by allowing long-lived HTTP connections. This overcomes limitations of traditional Ajax which uses polling. Comet enables new types of highly interactive web applications such as collaborative editing and streaming financial data. It works by having the client leave an HTTP request open to the server instead of closing after each response. The server can then push updates to the client without needing the client to poll repeatedly. There are different Comet architectures and techniques for implementing it on both the client-side, such as long polling and forever frames, and server-side. While not fully standardized, Comet provides a way to build real-time web applications today despite some browser limitations.
