This is a apache v2.0 authentication module. Based on html form authentication and cookie authentication session. Cookie session are stored in memcache deamon. Can be used has an simple "Single Signe-On" (SSO).
Excellent module, Apache should have this functionality built in. I was Finally able to replace my servers pathetic 401 popup with a professional looking PHP page with SSO.
Using the extra patch for multiple groups and users, this is one great SSO module!