Scenario:

Website is running on IIS, .NET 4.5. Uses FormsAuthentication cookie to sign in.

Assume the user opens two tabs to the app, without being signed in. Both tabs would direct to the same exact login screen. Let's assume there's also a ReturnUrl key in the URI.

Now the user logs in on one tab.

Is there any way to automatically get the other tab to pick that authentication up, even on refresh, and redirect to the ReturnUrl?