Forms Authentication - Two Applications on 2 Servers

Hello,

We have a ASP.NET application (A) running on a web server using Forms authentication (cookie based). We have another ASP.NET application (B), running on a different server.  After a user logs-in to "Application A" using Forms Authentication, they should be able to navigate and access any page on "Application B", without having to log-in again. How to accomplish this?

Please advice.

Thanks.