VIEWSONIC TD2455 23.8" 16:9 Multi-Touch IPS Monitor - Manual (Page 26)

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Hot Keys
When the On-Screen Display (OSD) Menu is off, you can quickly access special
functions by using the control panel keys.
Key Description
2 + 3 Press and hold the keys to lock/unlock the OSD Menu.
When the menu appears on the screen, continue holding both keys
for 10 seconds to lock/unlock the OSD Menu.
1
OSD Lock/Unlock
Locking OSD
Press and hold for 10s
to lock OSD
If the OSD Menu is locked, the below message will appear on the
screen:
OSD Lock/Unlock
OSD Locked
1 + 5 Press the keys to toggle between DDC/CI or DDC/2B.
DDC/2B DDC/CI