One of the most basic laws of a web application is that the client, not the server, must initiate any communication between the two. There are a number of common-use cases where, ideally, the server would like to talk to the client-dashboards and monitoring apps, chat rooms and other collaborations, and progress reports on long-running processes. Comet (a.k.a. Reverse Ajax) provides a mechanism fo... Now you can buy Books online in USA,UK, India and more than 100 countries.
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