kms8 likely refers to a KMS host server running on Windows 8 or a KMS setup using a KMS key for Windows 8.
msguides.com is a website that provides guides and tutorials on various Microsoft-related topics, including Windows activation, KMS, and Volume Licensing. slmgr skms kms8 msguides com
These terms are related to Microsoft's Key Management Service (KMS) and Volume Licensing. kms8 likely refers to a KMS host server