When a single sign-on is used, a client is asked to provide the user name and password information only once. The provided identity then propagates throughout the system.
Single sign-on using Tivoli® Access Manager WebSEAL is supported for Process Portal and for Business Space only. Single sign-on from Windows to BPM (for example, to Process Portal) can be achieved using SPNEGO.
For more information about single sign-on, refer to 
Creating a single sign-on for HTTP requests using
SPNEGO Web authentication.
