LG DOUBLEPLAY MFL67441301 - Manual (Page 39)

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NOTE: The applications supported on the second
screen can be used on both the main screen
and the second screen simultaneously. However,
the two screens cannot be used simultaneously
when using the Group Text, Music and Rich Note
applications. If you run one of the applications
above on the second screen while the same
application is running on the main screen, the
application on the main screen will be displayed on
the second screen and the most recently executed
screen will be displayed on the main screen.