I will soon be using WordPress MultiSite to manage a network of portals. Ideally, I would like to support a single sign-on for all portals and our forums. We don't really need extensive integration--we just want our forums to share login credentials with WP MultiSite: if a user signs onto our forums, s/he should be able to comment on any portal post; if a user signs into any of our portals, s/he should be able to post on our forums. We would probably be willing to pay a developer to create something like this. My question is, Is it even possible to do?
Thanks for your insight.