Single sign-on (SSO) is a service where a user can log in to one application and be automatically signed in to several other applications. With SSO, a user logs in once and is not prompted to log in again at each of the other applications.
If you have an existing web application and want your members to access the Communifire community without explicitly creating a registered account and logging in, then you must use SSO. You can use SSO between domains, when you have different sites in two different sub-domains, but within the same second-level domain.
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