Acer ICONIA - Manual (Page 48)

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Device Control
Device Control is a convenient way for you to control the brightness of each
screen, turn the backlight on or off for each screen, and adjust the volume to
suit your needs. It also indicates the location of each port on your computer and
allows you to turn your connectivity devices on or off, select a power scheme,
lock your computer, turn it off, or place it in Sleep mode.
If you have any devices plugged into a USB port or the HDMI port, Device
Control will show what type of device is plugged into each port. If you have
inserted a storage device into a USB port, you may tap the USB icon to open a
context menu. Tap Open to view the files in Windows Explorer.
To safely remove the device, select Eject from the menu.
There are also context menus available for the HDMI and VGA connectors.