Orchard CMS: Using different Layout for Anonymous users

Hi guys,

I would like to use a different layout view for anonymous users. I have tried using url alternates and I am not sure how I can create a layout for anonymous users since there is no particular url for them. The idea is that, if a new user visits the site I want to show a splash screen with very limited information with an option to register/ login to view the full site. This splash screen will have a completely different layout / look and feel from the rest of the site. I tried using the Anonymous user layer but all I could do was move widgets (maybe I am missing something).

Thanks to all