Closing a program in Windows 8 varies depending on whether the program you are using is a Windows Store Application, or if you using a "normal" windows desktop application
Windows 8 (Windows Store) Applications
Windows 8 Applications can be closed in the following ways:-
1.Dragging the application from the top of the screen using mouse pointer (or with your finger on a tablet device)
When you move your mouse to the top of the screen the cursor will change to a 
icon - click and hold the left mouse button and drag down towards the bottom of the screen
Or if using a tablet swipe down from the top of the screen towards the bottom
2.If using a device without a touchscreen then a close button will now appear in the top right hand corner when you move your mouse to the top of the screen - click this to close the app
3.Using the Switch List
4.Pressing Alt + F4
Windows Desktop applications
Windows Desktop applications can be closed in the following ways:-
1.Clicking File > Exit
2.Clicking the 
icon in the top right hand corner of the program
