We got our Sharepoint synchronized with Active Directory account names. So, the authentication goes through AD.

The question is, how to see these account names in Sharepoint? How to manage it as from Sharepoint side?

To be specific, one user in our system has several account names. Somehow, while using the services, current user account jumps from one to another. Does someone had such experience? How and where to admin this? How system decides which account it should take?

Any comments will be appreciated. thanks