Navigation between views

Hi.

I wonder how I can do a navigation when I want to go back from a view (ViewC) when the user can navigate to that view from both ViewA and ViewB.

I guess the WDPortalNavigation only lets you navigate to different iViews, but I'd like to go back in the users navigation history one step.

How do I do that? Is there a way to do it or do I have to keep track of how the user navigates?

Thanks.

/Mikael