Reading "ID" Portal profile attribute with HTML or JS?

We need to grab the "ID" session variable (profile attribute) from some non Lawson code to determine the users AD account since they are not logged onto Windows with this account. I can access it within code in Lawson but need to grab it in IIS for a thrid party SSO connection. Has anyone found a way to read the <> from code sitting on the IIS server? Thanks.