Connecting through Zend-Auth to TikiWiki
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This document is exploratory, not authoritative. It likely contains errors, which as it is on a wiki, you are invited to help fix.
http://framework.zend.com/manual/en/zend.auth.html details the Zend-Auth mechanism. As Magento is based on Zend, it is believed that Magento can authenticate through the Zend-Auth system to backend authentication schemes such as Central Authentication System (CAS) http://www.ja-sig.org/products/cas/
CAS is supported by many other platforms such as TikiWiki.