Multitasking - Acer Liquid Z630 User Manual

Drag the Notification area down the screen to view more information
about new events. Drag the Notification area again to access the
Quick Settings.

Multitasking

You can have multiple apps open at the same
time. To open a new app, tap the home button
to return to the Home screen, then start the new
app. Tap the Menu button to quickly navigate
back and forth between previously-opened
apps.
Note
To extend battery life, it is better to close an app when you've finished using
it. Do this by either pressing the Back key until it closes or the Menu button
and selecting Exit (if available).
Using your smartphone - 21