Web user requests a dynamic resource from Web server, providing authentication reference. Web server requests application function from application on behalf of Web user, providing Web user's authentication reference. Application requests authentication document from enterprise security system, corresponding to Web user's authentication reference. Enterprise security system provides authentication document. Application performs application function for Web server.
Web server generates dynamic resource for Web user.
Added set of high-level use cases. Changed diagrams of detailed use case scenarios to use sequence diagrams instead of use case diagrams. Added description of each use-case scenario and list of requirements flowing from the scenario. Gave requirements labelled names for easier reference. Corrected various editorial mistakes.