With previous Microsoft Windows, you probably accessed the power options via the Start menu. But with that gone in Windows 8 there are new ways to lock, switch users, log off, restart and shut down:
· To lock your account: Hit Win + L on the keyboard, just like in previous Windows editions.
· To log off or switch users: Open the Start screen, select your account name in the upper right, and choose Sign Out or select another user account to switch users while keeping logged in.
Logging off or switching users via the new metro-style Start screen.
· To restart or shut down: With a mouse, put the cursor on the top or bottom right corner (or hit Win + I). Or with touch, swipe in from the left. Then select the Settings button from the charms bar, hit the Power button, and select Restart or Shut Down.
Restarting or shutting down via the settings Charm Bar.