Microsoft has been going into very exacting detail as to how Windows 8 works, but one area it hasn't explored much is what happens before you even see the Start screen. As user experience manager Chris Clark notes, the days of mashing F8 repeatedly to reach a pre-boot configuration are (mostly) over: you can invoke it either through an "advanced startup" in settings, through Start menu shortcuts or, if your PC is truly sick, let it show automatically. At least on systems blessed with UEFI
