[otrs] AD Single Sign On

Hello, I'm trying to figure out how to get OTRS to do single sign on with AD. I've managed to make LDAP work according to the manual, however the documentation for true single sign on is confusing. How is http basic auth supposed to function? And does OTRS really do seamless logins? Kind of a newbie here, if someone has a walkthrough that would be great. I'm sure this has been brought up a dozen times. Using: AD 2003 OTRS 2.2.2 CentOS 5 Everything works great, just trying to get SSO working. The only thing I've found is a module for OTRS 1.3 or similar versions. Thanks, Derek Blevins