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    <p>Unfortunately you will not find one. Reverse Ajax is a complex task that requires both server side and client side "magic" in order to be cross-browser compatible, have proper state and thread management and be scalable. Essentially a comet server is a streaming connection per client (or long polling) + clever thread management. In addition for a proper comet server you would have to fully implement <a href="http://svn.cometd.com/trunk/bayeux/bayeux.html" rel="nofollow noreferrer">the Bayeux protocol</a>.</p> <p>There is an article on <a href="http://www.google.com/search?hl=en&amp;safe=off&amp;&amp;sa=X&amp;ei=eB80TcDEHYiKvQORoenVCw&amp;ved=0CBYQvwUoAQ&amp;q=comet+server+codeproject&amp;spell=1" rel="nofollow noreferrer">CodeProject</a> on how you can implement something like that in IIS, but even that is immensely complex.</p> <p>We've considered implementing something of our own but quickly decided against that, since that would cost us months of work, so those products come out really cheap.</p> <p>Also, if you are really interested on how to implement something like that the best place to start would be to dig into WebSync source code, since it's not obfuscated. Be careful with plagiarism though as they have quite a few unique know-hows in there.</p> <p>Another option is to consider other platforms (open source comet servers in other languages). You may find them to be a lot more suitable for the task than C#. For instance, you will find <a href="http://www.google.com/search?sourceid=chrome&amp;ie=UTF-8&amp;q=comet+server+in+erlang" rel="nofollow noreferrer">writing a comet server in erlang</a> to be dead easy.</p> <p><strong>EDIT:</strong> There are actually already two great similar questions on SO that might help you: <a href="https://stackoverflow.com/questions/65673/comet-implementation-for-asp-net">Comet implementation for ASP.NET?</a> and <a href="https://stackoverflow.com/questions/333664/simple-long-polling-example-code">Simple “Long Polling” example code?</a></p>
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