Acer Liquid Z6 - Manual (Page 21)

Using your phone - 21
Swipe down twice or once with two fingers to open
Quick Settings, which allows you to quickly adjust
selected settings or turn features on or off.
Multitasking
You can have multiple apps open at the same time.
To open a new app, tap the home icon to return to
the Home screen, then start the new app. Tap the
Overview button to quickly navigate back and forth
between previously-opened apps.