This extension enables Typo3 to use the authentification made by the Apache server for Typo3 users.
One posible use is for intranet servers where users are logged in into a Microsoft Windows domain. Using the Apache module mod_ntml Apache is able to authenticate users based on their Windows credentials without showing the user a login box. But any Apache authentification scheme would work.
The extension provides hooks to import unknown users. An example of integration with eu_ldap wich is able to automatically import users from Microsoft Active Directory is provided.