Hi all, Anil pointed me at this article: http://www.jboss.org/community/wiki/SeamIntegrationWithJBossIdentity - it describes how to use Seam with JBoss Identity, which in turn allows Seam security to use a whole range of ways of authenticating a user provided by JBoss AS including single-sign-on with other JBoss apps, and NTLM support. Pete