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I'm not an expert on this as I've been looking at other areas, however your plugin will have to inherit from the GUIWindow class, which will allow you to override the OnMessage method for receiving messages.

There's also an GUIWindow method you can override called OnAction, which passes an Action object.

The GUIWindowManager class then has a SendMessage method for (guess what!) sending messages, however I get a bit hazy here about the implementation of this.

Look at existing plugin code to try to get some info (or to get some real info as I may be wrong!)