Videos about GateIn, the portal solution of 'JBoss by Red Hat' and 'eXo Platform'. gatein.org
Very few will read this question here, would be better to ask in the GateIn forum: tinyurl.com/2dr9m3w
Short answer though, GateIn supports JBoss Negociation tinyurl.com/262lhhb which does what you want
How can we implement desktop SSO? What I mean is if you have already authenticated via active directory to your desktop, and then I go into gatein portal, it will automatically log me into the portal. Can it use NTLM etc?