Keep session between different domains
I have 3 different ASP.NET 2.0 web applications (domains). Physically they not related to eachoter. Logically they must. So i want preserve the user session state between e.g. web appl A and web appl B. If the user is linked from A to B than B must know that user A is already logged in and vice versa, when a user is new the user must log in. But i do not want that a user must log in for 3 times if the user switched from website. All domains wil deploy on a webfarm.
I'm know how to use session objects and application objects.
Is there some settings in IIS6 ?