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Silverlight MVVM and ViewModel Lifecycle

I'm working on a Silverlight 4/RIA services app, and I'm wondering when ViewModels are unloaded on the client. Specifically, I need to know if additional clean-up is necessary when a user logs out (I don't want another user to log in before the app is unloaded in the browser and potentially have access to data they shouldn't).

My understanding is that the ViewModels are unloaded when the view is unloaded, but I can't find any additional information.

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