Samsung SM-P900 User Manual page 25

Basics
You can use two types of Multi Window.
<Split screen Multi Window>
Using a split screen Multi Window
Use this feature to run applications in a split screen.
You can run up to four applications on the screen at the same time.
Launching applications in a split screen Multi Window
1
Drag your finger from the right edge of the screen towards the middle of the screen.
Alternatively, tap and hold
The Multi Window tray appears at the right side of the screen.
.
25
<Pop-up Multi Window>
Multi Window tray