By default, the Windows 7 and Windows Server 2008 R2 operating systems use KMS for activation. In volume installations, the setup key is installed by default, which makes the system a KMS client. If you are converting a computer from a KMS host, MAK, or retail edition of Windows to a KMS client, install the applicable setup key (GVLK) from Table 9 using slmgr /ipk <setup key>.
Table 9. KMS Client Setup Keys