Dual Boot Windows 7 and 10 with same key?

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Does anyone know if it will be possible to dual boot Windows 7 and Windows 10 without having to install Windows 7 twice and upgrade?

 

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I don't think so; once a key is registered on an installation, it has to be deregistered to be used on another install. Even simply reinstalling Windows 7, will require another activation request to be sent to MSFT.

If that is the case Microsoft can keep Windows 10.

 

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I have dual booted Windows 10 and Windows 7 and I can confirm you are wrong, you can use the same key.