ASP.NET MVC: How to handle model data that must go to every view?

So if there is some global state that every view of an MVC app will need to render ... for example: IsUserLoggedOn and UserName ... whats the appropriate way of getting that information to every view?

I understand that that part of the view should be in the master page or in a partial view thats added to the other views. But whats a good way to make sure the 'global' model data is passed to the view every time from all the relevant controllers and actions?