Today I was really amazed.
History: In November, I installed the Win8 DE on my HP desktop. Then I got a new Dell desktop on Christmas. I cleared the disk on the HP and gave that system away.
Now I just reinstalled Win8 DE on my new Dell. To my great amazement it not only found my desktop picture that I had used on the HP Win8 installation but it also made the setting for the German qwertz keyboard I used at the time - whilst I now use a US qwerty keyboard.
They must be keeping that info at the MS site, because there are absolutely no common denominators between my old HP system and that new system - different disks, different keyboard, different everything.