Key Management Services (KMS) activation planning
https://learn.microsoft.com/en-us/windows-server/get-started/kms-activation-planning
WebDec 23, 2021 · KMS uses a client-server model to active clients and is used for volume activation. KMS clients connect to a KMS server, called the KMS host, for activation. The KMS host must reside on your local network. KMS hosts do not need to be dedicated servers, and KMS can be cohosted with other services.
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