...
Federated Single Sign-On (SSO) is a service that allows users to log in to multiple web applications across multiple domains using a single set of credentials. This is also known as Federated Identity Management (FIM).
...
On the Dualshield Administration console go to SSO>Federations
Click 
on the top right.
Specify a Name then add the web applications by clicking on the 
right.
Place a check in the corresponding box.
Add as many applications as you need and click Save
