We have integrated a .NET application with Sforce. Once the Sforce user logs into Sfocre.com he can click on one Web Tab which will redirect him our application.

Now, we want the user to be logged into our application without authenticating him once again (by our application) as he already been authenticated by sforce earlier. So, is there any way to get the session details (from Sforce.com) so that we can pass the same into our application?

In other words we want to implement single sign on here.

Please advise how to do this.

Suneeth