Closing an Application
When you run apps from the Windows 8 Start Screen and switch to another one, the original app that you were using is not actually closed. Instead this App is left running in the background so that you can easily switch between them.
There are 4 methods to close an app in Windows 8
Method 1- Alt+F4 :
The Alt+F4 keyboard combination is by far the easier method that you can use to close a Windows 8 app, but it can only be used when you are actually using the particular app.
Method 2 – Click and Drag
Move your mouse cursor to the top of the screen while the app is open, click it, and drag the window down to the bottom of the screen.
Method 3 – Side Bar
Put your mouse on the left corner of the screen and move down to get the side bar with current apps. Right click on the app you want to close and select close.
Method 4 – Task Manager
Open Task Manager from the start screen and select process. Under Apps select the app you want to close and click End Task .This will close the App.This method is least preferable as any unsaved data will be lost when an app is terminated through this procedure.
Use two Apps simultaneously
You can snap an open app into the right or left third of the screen by simply tapping and dragging it to the left or right edge of your screen until a thin vertical bar appears.
Put your mouse on the left corner of the screen and move down to get the side bar with current apps. Right click on the app you want to snap and select snap right or snap left.