Since the release of Windows 8, many users have been asking for Microsoft to let them boot directly to the desktop, instead of the new Start screen. The feature, which is quite trivial in the grand scheme of things, has yet to arrive for the platform and Microsoft has been quiet about the request.
Over the past few days, evidence and even a few sources, were chiming in about the feature claiming that Microsoft is working towards giving the consumer the option to bypass the Start screen upon boot. But, it looks like the previous string that highlighted this feature may not be as conclusive as previously thought.
A user on the My Digital Life forums is stating that the string that gave many users hope is actually tied to Kiosk mode for Windows 8 and does not actually bypass the Start screen.
twinui-CanSuppressStartScreen is related to a "kiosk mode" and I didn't find any other feature that it controls, at least in this early build. You'll have to set twinui-CanSuppressStartScreen to 1 in the ProductPolicies key (via ProductPolicyEditor from wsservice_crack) and create a DWORD key "KioskMode" in HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Exp lorer\StartMenu with value 1. Any user without admin rights then gets a blank screen instead of the start screen (it does not switch to desktop automatically, you can start any desktop or store app with the search charm though).
Provided the above information is correct, it looks like the solid evidence may not be as conclusive as previously indicated. We only have this small bit of information to go on for now but Microsoft is expected to release a public preview of the platform in June which will clear up any confusion.
For now, it's all a rumor at this point and take any leaked information with a pinch of salt as anything could change before the release of the platform.
Source: My Digital Life | Image via Microsoft Portal