HTC One M8 for Windows - Manual (Page 41)

§ If you see letter tiles in your app list, tap a letter tile to see all of the
alphabet tiles. Then tap a letter to quickly jump to the corresponding
section in the app list.
Action Center
With a simple swipe, you can see all of your notifications—even from the
lock screen.
Swipe down from the top edge of the screen with one finger. You'll see all
of your notifications, quick actions, and a shortcut to settings.
Your first week with your new phone 41