Asus P535 - Manual (Page 126)

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Programs running in memory
Allows you to activate or stop any program
running on memory.
Settings
Allows you to select the items to display in
the ASUS Settings pop-up menu.
IMPORTANT:
When you exit a running program, you are actually
only minimizing it and the program remains in the
memory. You can stop these programs from running
in the background using this option.