The Settings charm
This charm gives you access to a wide variety of application-specific and system-wide settings. The top part is context sensitive, showing settings related to what you're currently doing in Windows 8. From the Start screen, for instance, you can change settings related to tiles, such as whether to show tiles for administrative tools.
The bottom part of the Settings charm is the same no matter where you are; it lets you change global Windows 8 settings for your network, sounds, screen, notifications, power and keyboard. Click the "Change PC settings" link at the bottom of the screen to get to the new "PC settings" screen, which we'll look at next.