A system that allows a user of a first domain to access a second domain. A request originates in the first domain to perform an action in the second domain. The request indicates a user of the first domain on whose behalf the request was originated. The access request is received by an adapter in the...http://www.google.com.hk/patents/US7275259?utm_source=gb-gplus-share專利 US7275259 - System and method for unified sign-on
