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This application is built on the WCF .NET Framework 3.0. It uses duplex communication and TCP binding (for some reasons that are discussed later in this article). It concentrates on handling and controlling a WCF service that has to make reliable sessions with many clients and keep those connections alive as long as possible.

Its the article of how you can create serious web applications via PokeIn comet ajax library in minutes

What you should to do to create your own Silverlight Voice/Video chatting system.