WCF Tutorial - Events and Callbacks. In our previous WCF Tutorial, we described how to make a very simple client/server application where clients would call functions on the server through a shared interface.
In this tutorial, I'm going to expand that application to allow the server to execute functions on the client by using callbacks. Essentially, this is WCF's mechanism to allow events to be raised from the server to it's connected clients. If you're new to WCF or you haven't read the previous WCF tutorial, I would highly recommend it. This post will be utilizing the example applications produced from the first one, so some explanation may be left out.
WCF Tutorial - Basic Interprocess Communication.