The SSO Library is a collection of code written in PHP by Central Web Services to provide convenient ONID SSO authentication and session management functionality. It was developed for web applications being built by CWS, but anyone is free to use it.
ONID Single Sign on allows a user to authenticate to a web page using their ONID credentials. Once authenticated, they can then travel to another SSO enabled website and are logged in automatically. It is important to note that SSO only supplies authentication and not authorization