The VSS Administrator enables you to manage users that have access to the SourceSafe databases. Using this tool, you can
Add, edit, and delete users who have access to the VSS databases
Change user passwords
Set user access to read-only
Lock a VSS database
Clean up a VSS database and remove temporary files
Create new VSS databases
Archive projects
Restore projects
Change default application-level defaults, such as multiple checkouts, default project folders, and file type extensions that are allowed to be stored in the VSS databases
Figure 20.1 shows the VSS Administrator open with the Options dialog in the foreground. When you install VSS, two users are added to the database by default: Admin and Guest. The Admin password is blank, and if you're working on a network with multiple developers, you'll most likely want to change this password. On single-developer installation, you can leave the Admin password blank for ease of use. Each time you open a VSS tool, you must enter the username and password.
Depending on the environment you're working in, you might never use this tool. I've used SourceSafe for years in single-developer mode, and I've never opened the Admin tool.