There are two types of users in Windows: Local users and domain users.

Local users:

 Are those which you can only use in the same machine they’ve been created.

Here you can be a standard user, who has limited rights, for example it can’t change the IP address.

You also can be an administrator, who is more free at working with the computer and with the security options.

Domain users:

A group of computers which you can access to from another computer called Domain Controller. From this one you can allow or deny several actions to the rest of the group, for instance changing the wallpaper.  The password of these users is verified from the Domain Controller. The disadvantage of this is that if you don’t have Access to the network, the user’s name cannot be validated, so if this happens you cannot work.

Every time you finish working from a Domain Controller you must log off (search on the keyboard “ctrl”, “alt” and “supr” and press them all at the same time to Access to a panel in which you’ll can log off).