Duplex Services
Ordinarily, web services use a fairly straightforward and somewhat limiting form of interaction. The client (your Silverlight application) sends a request, waits for a response, and then processes it. This is a distinctly one-way type of communication—the client must initiate every conversation.
This model is no surprise, because it's based on the underlying HTTP protocol. Browsers request web resources, but websites can never initiate connections and transmit information to clients without first being asked. Although this model makes sense, it prevents you from building certain types of applications (such as chat servers) and implementing certain types of features (such as notification). Fortunately, there are several ways to ...
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