LG P999 - Manual (Page 87)

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Applications
Unknown sources – Permits installation of
applications that you obtain from websites, email or
other locations other than Android Market.
WARNING: To protect your phone
and personal data, only download applications
from trusted sources, such as Android Market.
Manage applications – Manage and remove installed
applications.
Running services – Allows you to view and control
currently running services and applications. This
option displays what processes each running service
needs and how much memory it is using.
Development – Allows you to set options for
application development, such as
USB debugging,
Stay awake, and Allow mock locations.
Accounts & sync
<General sync settings >
Background data – Permits applications to
synchronize data in the background, whether or not
you are actively working in them. Unchecking this
setting can save battery power and lowers (but does
not eliminate) data use.