Concepts
VSys security is designed to allow you to limit the actions that users are allowed to perform. It also affects tracing, if it's enabled. When you use VSys security, actions which are logged in tracing include the user ID of the person who made the change.
Users are people, too.
In VSys One, your users start as regular people in your database, but they are given additional login IDs, passwords and security rights. You'll often create a separate group for your users, but this is not required.
Superusers
Superusers are a special type of user, one who has a complete security bypass. You must have at least one administrator who's a superuser to enable or disable security.
Hidden tools
Most tools that users don't have access to due to their security rights are hidden from view or disabled. Whole panels may disappear from view, menu options become invisible or disabled, and editors open in read-only mode even when you're trying to edit.