User account creation
Catherine has written some python-based tools for user account creation and password resets in the Departmental Active Directory; these are located on apps. See the Computer Officers wiki for details if you are a computer officer or member of the IT committee.
Subsequent to the account creation, you need to make further modifications using ADUC on one of the domain controllers. The set of DCs varies but if you connect to ad.ch.cam.ac.uk you will always hit a current DC.