Google ANDROID Quick Start Guide (4.4, KitKat) - Manual (Page 8)

ANDROID QUICK START GUIDE WELCOME TO ANDROID 4
Get around
At the bottom of every Home screen you’ll find the Favourites
tray: another quick way to get to your apps. Here’s what it looks
like on a Nexus 7.
To open an app, touch it. To drag an app in or out of the
Favourites tray or anywhere else on a Home screen, touch & hold
it, then move it with your finger into position.
Nexus navigation buttons
At the bottom of every Nexus screen, no matter what you’re
doing, you’ll always find the navigation bar with three buttons:
Back
Opens the previous screen you were working in, even
if it was in a different app. Once you back up to the
Home screen, you can’t go back any further.
Home
Opens the central Home screen. To open Google Now,
swipe up.
Recent apps
Opens a list of thumbnail images of apps you’ve
worked with recently. To open an app, touch it. To
remove a thumbnail from the list, swipe it left or right.