Since Windows 2000, a user of a domain can be enter up to 10 machines on the domain. When joining to the domain, a login and password is requested. It will be sufficient for a user to enter his username and password. He will be able to do the same for 9 other stations.
It is therefore recommended to deactivate this “option”, to do this you will need to make modifications using the “ADSI Edit” tool.
Click here to have all the steps.