I buy a new notebook and want to use the Windows 10 key from my old notebook. Is that possible? And in general, is it possible to use one key for multiple devices?
Basically not. On my PC, it was also the case that I was able to re-enter the key that I had actually redeemed before
You can take it over.
But only for one device, not two at the same time.
And in general, is it possible to use one key for multiple devices?
No.
One key = one license. You need one license per computer, anything else would be scam. You can't use the same license on multiple computers that can be used at the same time.
And Windows 10 does not legally cost the world, see e.g. Here: https://www.rakuten.de/produkt/microsoft-windows-10-professional-vollversion-download-1-pc-2591462060?rtg=a37ef9722846bcc402aa5f4800d3938f
Is that possible?
-> No.
And in general, is it possible to use one key for multiple devices?
-> No.
There's the EULA for this
It is binding for every user!
Exceptions are volume licenses, these can be installed on several PCs or notebooks
