Windows Software Licensing Management Tool, slmgr.vbs is a command line licensing tool. It is a visual basic script used to configure licensing in Windows and also helps you see the licensing status of your Windows 10/8/7 installation.
Activation is the initial process by which a Windows running on a PC is determined to be properly licensed and genuine, and it’s really quick and easy. It is different from Registration, in the sense that, Activation is the process of ensuring that your copy of Windows is used according to the Microsoft Software License Terms, whereas registration is the process of entering information to sign up for product support, tools and tips, and other product benefits.
View Licensing Status & Activation ID
To see the licensing status of your Windows 10/8/7 installation, open the Run box, type the following and hit Enter:
The following dialog box will appear.
To get all the Activation IDs for the installed version of Windows, open the Run box, type the following and hit Enter:
slmgr.vbs /dlv al
Because of WMI changes in Windows 10/8/7 and Windows Server, the Slmgr.vbs script is not intended to work across platforms. Using Slmgr.vbs to manage a Windows 10/8/7 or Windows Server system from the Windows Vista operating system is not supported.
If you want the Windows operating system to attempt activation by using whichever key has been installed in the operating system, on a client computer, open a Command Prompt window, type the following command and hit Enter:
The /ato command helps in this case.
If you are looking for more Slmgr.vbs Options visit TechNet.
Troubleshooting Windows Activation States may also interest you!
Go here to find out how to check the activation status & type of Microsoft Office.