Asus ET223 series User Manual page 37

Start button on Desktop mode
Context menu
The context menu appears as a box filled with quick access to some of
the programs inside Windows® 8.1 when you right-click on the Start
button.
The context menu also includes the following shut down options for
your ASUS All-in-One PC: sign out, sleep, shut down, restart.
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ASUS All-in-One PC ET223 and ET203