I'm more inclined to go with you Carlsd. Microsoft must have some way to stop you installing the OS multiple times on a machine which has "digital entitlement"

Cheers, this is the information I have been looking for :D

Yes, I wonder if at anytime during the installation of a second copy will I be halted because i'm violating the license agreement.

Now we are getting somewhere. Where does it say this?

Yes, I had an original key for Windows 7 but have now upgraded to 10. If I do a clean win 10 install now I will not be asked for a key. "Digital entitlement is a new method of activation in Windows...

Well I have a gaming OS which is games only and an every day OS that the family uses and installs whatever crap they want. So you are suggesting it is not legal to install multiple copies on the one...

There are no keys for windows 10

Yes, I am talking about multiple copies of windows 10 on a single machine. The activation servers don't check for an already installed windows 10 copy?

So now Windows 10 is linked to my hardware and no license key is required. So I can install windows 10 as many times as I want on the one machine in a dual boot environment?