This charm provides you access to system-wide as well as application-specific settings. It can be used for both, metro and desktop apps.
The resulting pane on the right edge shows settings for system as well as the current application (if any). The pane of this charm is commonly divided into two areas. The upper area contains the application-specific settings. The lower area contains the system-wide commonly used settings.
The system-wide settings contain six commonly used options:
Besides that, it also provides further access to Metro control panel with “More PC settings” option.
It obviously depends on the current running app. The limitation, however, is that these settings are exclusive to Metro apps.
In the Messaging example, you have options like
The sub-settings are provided within the pane only. This way, it becomes less intrusive.
The access to frequently used global settings is a nice touch in this charm. Obscuring the power options, however, may be one of the worst decisions in Windows 8.
The context-sensitive nature of this charm is its main advantage. It gives a consistent interface for settings of all the Metro apps. This way, changing the settings will become less intrusive. I bet anyone would find a right-edged pane quietly showing you options better than a settings window popping on your face and confusing you with several tabbed options.