If a Windows 8 application is showing something interesting and you'd like to record it for posterity, then hold down the Windows key, press PrtSc, and the image won't just go to the clipboard: it'll also be automatically saved to your My Pictures folder with the name Screenshot.png (and then Screenshot(1).png, Screenshot(2).png and so on).
You might hope that pressing Win+Alt+PrtSc would similarly save an image of the active window, but no, sadly not. Maybe next time.
You might hope that pressing Win+Alt+PrtSc would similarly save an image of the active window, but no, sadly not. Maybe next time.