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First I hear of this. Source? Googling for this predictably returned unhelpful results.

In VBS environments, the normal NT kernel runs in a virtualized environment called VTL0, while the secure kernel runs in a more secure and isolated environment called VTL1.

https://www.microsoft.com/security/blog/2020/07/08/introduci...

https://docs.microsoft.com/en-us/windows-hardware/design/dev...

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