Joomla SSO (Single Sign On) with mod_auth_tkt and tktcookie

Been wanting to get SSO working on the site for awhile to work with the Invoicing, Bugzilla and BackupPC systems. Joomla already has a database for accounts and the default security access of Joomla menus and pages are helpful - but how do I get Joomla to tell Apache once a user has authenticated?

Apache module mod_auth_tkt and a little unknown Joomla plugin called tktcookie hold the answer.

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