Acer ICONIA - Manual (Page 74)

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Window Manager
Your Windows desktop is extended to the lower screen, allowing you to work
on both screens using the touch functions.
Use Window Manager to control the windows on each screen. To launch
Window Manager, open Acer Ring and select Window Manager (please refer to
Acer Ring on page 7 for more information).
Window Manager gives you a touch-friendly interface for controlling the
various windows on your computer. Two additional buttons are added to the
title bar of any window. They provide an easy way to move windows from one
screen to the other by tapping the
icon on each window.