This white paper is the second in a three-part series on SSO to be published over the next month or so. See the previous paper, "Understanding single sign-on (SSO) between IBM WebSphere Portal and IBM Lotus Domino." This paper is designed to help administrators who have a good grasp of how SSO works and want an in-depth explanation of what steps are necessary to configure SSO between IBM WebSphere Portal and IBM Lotus Domino. It also explains how to verify that SSO is working correctly...

Source: http://www.ibm.com/developerworks/lotus/documentation/domino/d-ls-sso-portal-domino2/index.html