XPages Extension Library
To achieve SSO between IBM XPages (Lotus Domino or IBM XWork Servers) we took advantage of the Apache Abdera Open Source (Java) library to give XPages the ability to access the LTPAToken for use by IBM Connections. You can find information on Apache Abdera using the following link: http://www-10.lotus.com/ldd/lcwiki.nsf/dx/9.2_Using_IBM_Connections_API_in_different_programming_languages
The purpose of the attached code is to add the LTPAToken cookie to the AbderaClient object thus removing the need to call the AbderaClient.addCredentials() method more than once. Once the LTPAToken is set SSO integration has been achieved.
As Niklas blogged about, we integrated a similar piece of code in the extension library, so it can now use SSO between Domino and Connections.
Thanks again for your help!