How do I activate Windows on Slmgr?

On a client computer, open a Command Prompt window, type Slmgr. vbs /ato, and then press ENTER. The /ato command causes the operating system to attempt activation by using whichever key has been installed in the operating system. The response should show the license state and detailed Windows version information.

How can I tell if Windows is activated Slmgr?

Using the Command Prompt

Tap on the Windows-key, type cmd.exe and hit enter. Type slmgr /xpr and hit enter. A small window appears on the screen that highlights the activation status of the operating system. If the prompt states “the machine is permanently activated”, it activated successfully.