Provides essential methods related to Window Store application.
| arguments | Arguments passed to application. |
| InvokeOnAppThread | Executes callback item on application thread. |
| InvokeOnUIThread | Executes callback item on UI thread. |
| RunningOnAppThread | Returns true if you're running on application thread. |
| RunningOnUIThread | Returns true if you're running on UI thread. |
| TryInvokeOnAppThread | Tries to execute callback item on application thread. |
| TryInvokeOnUIThread | Tries to execute callback item on UI thread. |