authentication

I am planning to create an authentication management for drupal.
From my own experience, drupal does not provide a centralized authentication so that it is not very convenient to create external login,and some developers from the drupal forum requested for help of external login.
working with moodle i found moodle provides a user-friendly authentication interface for developers or administrators to configure.

refer to http://www.geocities.com/juanchengrong/moodle.JPG

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