A somewhat common request for projects, especially intranets, is to provide a single sign-on (SSO) system. At a rudimentary level, an SSO system allows one site to handle all logins (authentication) for a group of sites, rather than a visitor needing a separate login for each one. For an organization with several sites it can greatly reduce the headache for its clients, customers, employees, etc increase visitor satisfaction, reduce maintenance costs, and potentially increase sales.