Win.iso setup reboot process
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Curiosity premise: I always ran Win10 setup on a bootable USB, prior set in Bios as 1st boot choice. Now I see videos of Win10.ISO contents copied to C: drive on a separate created drive partition and installed by running setup.exe. Or some show the WinISO setup.exe being run from a mounted folder on the existing system partition drive. Question: How does windows.iso setup (repair or clean install) get the reboot process to re-enter the ISO setup several times, and pick up where it left (prior to reboot) instead of starting over. What logistics are involved, in brief if possible. Appreciate any comments and links to pertinent study material on this. (I've read some on BCDEdit but not sure if this is what's happening on this?)