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What's the best way to exchange Data between 2 XAP files that are in separate browser windows or maybe a browser window and a popup? each html/window with it's own .xap file

+3  A: 

Take look at the LocalMessageReceiver and LocalMessageSender classes in the System.Windows.Messaging namespace. For an overview for how this works review Communication Between Local Silverlight-Based Applications.

AnthonyWJones