Microsoft allowed large OEMs to pre-activate Windows without needing a unique product key for each machine. The OEM would embed a special certificate and a SLP key into the BIOS. Upon boot, Windows checks for three things:
Windows_Loader_v2.1.7_By_Daz.rar
Windows Loader 2.1.7 by Daz is a legacy third-party software tool designed to bypass activation for Windows Server 2008 R2 by emulating a System Licensed Internal Code (SLIC). How it Works Windows Loader 2.1.7 By Daz