Notes about Application

1. The event fired when the current user logs off or shuts down the computer: SessionEnding
http://msdn.microsoft.com/en-us/library/system.windows.application.sessionending.aspx

2. Some properties about window: Windows, MainWindow
http://msdn.microsoft.com/en-us/library/system.windows.application.windows.aspx
http://msdn.microsoft.com/en-us/library/system.windows.application.mainwindow.aspx

3. Customerize how to exit an application: ShutdownMode
http://msdn.microsoft.com/en-us/library/system.windows.application.shutdownmode.aspx

4. Start window: StartupUri
http://msdn.microsoft.com/en-us/library/system.windows.application.startupuri.aspx

5. A dictionary for the windows to share information: Properties
http://msdn.microsoft.com/en-us/library/system.windows.application.properties.aspx