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Single sign-on (SSO) is a specialized form of software authentication that enables a user to authenticate once and gain access to the resources of multiple software systems.
Web single sign-on (Web-SSO), also called Web access management (Web-AM) works strictly with applications and resources accessed with a web browser. Access to web resources is intercepted, either using a web proxy server or by installing a component on each targetted web server. Unauthenticated users who attempt to access a resource are diverted to an authentication service, and returned only after a successful sign-on. Cookies are most often used to track user authentication state, and the Web-SSO infrastructure extracts user identification information from these cookies, passing it into each web resource.
See also
* IDX
Discussion about SSO
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