This control panel shows the master list of accounts that have been set up for people who share your PC. (See Chapter 17 for more accounts, users, and groups.) You can't open the control panel at all unless you've been designated an administrator for this computer (Section 17.3).
On the Users tab, you can turn off "Users must enter a user name and password to use this computer," saving you the step of logging in every time you turn on the PC. Do so, needless to say, only if you're the only one who uses your computer (it's your home PC, for example).
You can also use this tab to add users to the various local groups on the computer, providing them with access to administrative functions they'd otherwise be denied. For example, if you normally log on using your domain account, you may find it irritating to have to log off and then log in again as the local Administrator to configure certain properties of your system. The Users tab (Figure 8-21) lets you add your domain user account to the local Administrators group, so that you have the access you need all of the time. By selecting a user and clicking the Properties button, you can also specify how much freedom the user has to make changes to this PC.
Figure 8-21. Click the Add button to add users to the local groups on the computer. All you need is a username for each and the domain name, or you can browse ...