Active Directory Integration

Hi, If I make AOS work with Active Directory, I want to know : Is it a kind off SSO ? If I’m registered in AD as axapta user, when I launch Axapta on my machine (I click on the icone) to connect as 3-tier thin, should I give my axapta login and password ? documentation tel all about AD before, but after we don’t know how it works with the users. Do they have to be registered on AD or not, what is the system behavior ? Thanks