Most KMS activations are only valid for 180 days, so these tools often install background tasks to renew the "license" periodically.
KMSnano 10 is a portable software tool designed to activate Microsoft products without requiring a purchased product key. It is based on Microsoft's legitimate technology, which is normally used by large organizations to activate thousands of computers on their own internal networks. How the Tool Works
In corporate environments, Microsoft sells Volume Licensing. Instead of entering a unique product key per computer, a company sets up a on its server. Every 180 days, client computers automatically contact that host to renew activation. This is legal and built into Windows Enterprise/Education and Office volume editions.
: Using these tools violates Microsoft’s Terms of Use and is considered software piracy. Organizations using such methods risk hefty fines and lawsuits.