Hi, I've posted a note reviewing Shibboleth on the GWS wiki page. This review informs the possible definition of a security architecture for us that uses bits of Shibboleth but is a more-capabale system. Cheers, Guy Guy Rixon gtr at ast.cam.ac.uk Institute of Astronomy Tel: +44-1223-337542 Madingley Road, Cambridge, UK, CB3 0HA Fax: +44-1223-337523