LG P999 - Manual (Page 27)

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If you do not use the phone for a while, the screen
you are viewing is replaced by the lock screen to
conserve the battery.
NOTE: If there are any programs running when you
set the pattern, they may be still running in lock
mode. It is recommended that you exit all programs
before entering lock mode to avoid unnecessary
charges (e.g. phone call, web access and data
communications).
Unlock the screen
To wake up your phone, press the Power/Lock Key.
The lock screen will appear. Touch and slide the
Unlock Key to the right to unlock the screen.
The last screen you were working on will open.
Home screen panels
Simply swipe your finger to the left or right to view
the Home screen panels. You can also customize
each panel with widgets, shortcuts to your favorite
applications, folders and wallpapers.
In your Home screen, you can view the Quick Keys
at the bottom of the screen. The Quick Keys provide
easy, one-touch access to the functions you use the
most.