Test your skills
Is it possible to reset the administrative password of all the domain computers using Active Directory at the same moment?
It is possible to change and reset the administrative password on all domain computer with Active Directory. You can do this in two ways: Group policy and with the use of a client side GPO extension.
To use the Group policy preferences to reset the password, you just need to amend the Default Domain Policy. To do that, you need to expand and go to Computer Configuration > Preferences > Control Panel Settings > Local Users and Groups > Right click on Local Users and Groups > New > Local User > Amend the information to the Following: Name-Administrator, Set the password to the New password you like > Apply.
To use GPO extension, details can be found here http://code.msdn.microsoft.com/Solution-for-management-of-ae44e789.