Using The Navigation Buttons - Google Android 3.0 User Manual

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Using the Navigation buttons

AUG-3.0-100
The System bar's Navigation buttons make it easy to quickly switch among Android
apps.
In some media apps, the System bar controls are replaced by dim dots when you're
watching a movie, slide show, and so on, so you can better enjoy them without the
distraction of the System bar. You can touch a dot as it if were the control it stands
for, or touch a blank area of the System bar to restore it to full view.
Back Opens the previous screen you were working in. If the
onscreen keyboard is open, the button changes to a down
arrow and touching it closes the keyboard.
Home Opens Home. If you're viewing a left or right Home screen,
opens the central Home screen.
Recent Apps Opens a list of thumbnail images of apps you've worked
with recently; touch an app to open it.
Legacy Opens the options menu for applications designed for pre-
vious versions of Android.
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Android User's Guide