Ever wondered why size of Active Directory database is different on domain controllers? You might ask yourself if Active Directory supports MultiMaster technology, then all objects reside in database on all domain controllers, so if that is true, why the size of database (NTDS.DIT) is completely different on one domain controller to another?

Considering this fact, each day we face new problems and requirements which we need to deal with. During these years there have been so many requests from System Administrators or specialist to have a feature in Active Directory which allows administrators to select a user to login only once in a time and prevent multiple logins from a user account in Active Directory.