Search—Allows you to type one or more keywords to search with Google.
All apps—Displays a list of all apps installed. To configure your preferences, touch , and then touch the Settings icon.
Recent apps—Opens a list of apps used recently.
Home—Opens the Home screen.
Back—Opens the previous screen.
Voice search—Allows you to speak one or more keywords to search with Google.
NOTE: The appearance of the Home screen may vary.
, and then touch the Settings icon.
Recent 
, and then touch the Settings icon. Recent 