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    <p>There is no right and wrong answer to your question - it all depends on what you require. You then can choose the best architecture for your needs, and then the best technology for that architecture.</p> <p>There are two things to consider - how will users find people to chat to, and then once they have found someone - how do the applications connect to each other.</p> <p>For users to find each other, you either need to connect to a central server, which will then show a list of all connected users, or users need to enter the IP address of the person they want to chat to. Note that some firewalls will block incoming connections in this second case, so this may not be feasible in some cases.</p> <p>Next, once you have found the person you wish to chat to, you need to decide whether messages will route directly to the other user, or if you want to continue to go through a central server.</p> <p>If you choose to go through a central server, then your application will be functioning as a client, and will therefore pass through firewalls without a problem. However if you connect directly to the other user, both copies of the application will be acting as a client and a server (P2P topology), and therefore firewalls may be an issue. Having said that, you could designate one of the applications to be a server, with the other acting as a client, in which case only the server side needs to worry about the firewall.</p> <p>Without knowing exactly what you are trying to achieve, it is hard to recommend which architecture will work best for you.</p>
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    1. POC#, WCF, want to make a chat application, what binding should I use? maybe some examples?
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    1. USGavin Coates
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