Windows 8 allows certain app like Skype, News, and other apps to run in the background so you always have up-to-date information and Live Tile notifications. But, sometimes you might want to disable them from running in the background if you don’t need them or updates from the app just get to obnoxious.
The easiest way to disable apps from running in the background is now allow them to during initial set up. For example, when you launch the Skype app on Windows 8 the first time, it asks if you want to allow it to run in the background. Select Don’t Allow.
If you do allow an app to run in the background, you can change that behavior later. Use the keyboard shortcut Windows Key + I and select Change PC Settings.
Then select Personalize on the left, and under Lock Screen Apps, click the icon for the app you want to stop running in the background. In my case, Skype, then select the Don’t Show Quick Status Here” link.
Or in some apps, like Skype for example, you can go into it’s Permissions and turn off allowing it to run in the background.
For more on turning off notifications in Live Tiles that run in the background, check out how to turn off Live Tiles in Windows 8.