A multi-user operating system allows multiple users to access the computer's resources simultaneously or sequentially. In Windows 11, this is managed through the Security Accounts Manager (SAM) and user profile architecture. When a user creates an account, the OS generates a unique Security Identifier (SID) and allocates a specific directory structure (e.g., C:\Users\Name ).

If you want to move between accounts fast, these shortcuts are your best bet:

: Press these keys together and select Switch user from the security screen to go directly to the sign-in options.

While on your desktop (with all other windows minimized), press Alt + F4 . In the dropdown menu, select Switch user and click OK . 3. Using Task Manager (For Power Users)

You can switch between user accounts without signing out or closing open apps. Here are the most common methods:

This architecture ensures that application data, browser history, and desktop preferences are isolated. The "Switch User" feature is a manifestation of session isolation. Unlike "Logging Off," which terminates all running processes for the current user to free up system resources, switching users leaves the first user’s session active in the background. This utilizes a process known as "session isolation," allowing a second user to log in while the first user’s applications remain running but inaccessible.