3.3.5.4.3 Relying Party Security Realm Discovery

As specified in section Relying Party Web Browser Requestor Sessions List (section 3.1.1.5.2), a resource IP/STS MAY store a session identifier for the web browser requestor in an HTTP session cookie (for more information, see [RFC2965]). It SHOULD use this identifier and its Outbound Sessions List to develop the list of WS resources to which it SHOULD send wsignoutcleanup1.0 request messages.<81>