HEU KMS Activator is a simple and efficient KMS/OEM intelligent activation tool, applicable to all versions of Windows and Office. It can be activated with one click without an Internet connection. It supports UEFI KMS activation tools. KMS service is Microsoft's volume licensing service for Windows, Office and other products. KMS can be used to activate products in the local area network. This tool uses the KMS mechanism to build a KMS server in the system to achieve online or offline activation.