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You see a screen like this:
1
Power button control
2
Selects the
HDMI1
port source
3
Selects the
HDMI2
port source
4
Selects
Video
port source
5
Selects the USB Display source
6
A/V Mute
button control
7
Freeze
button control
8
Page Up
and
Page Down
button controls
9
Displays closed captions
10
Displays a QR code
11
Volume
button controls
12
Selects the USB device source