Samsung SyncMaster 2443FW User Manual page 54

Adjusting the Monitor
This is the function that locks the OSD in order to keep the current states of settings or prevent others
from adjusting the current settings.
Lock : Hold down the MENU button for more than five (5) seconds to activate the OSD adjustment
lock function.
Unlock : Hold down the MENU button for more than five (5) seconds to deactivate the OSD adjustment
lock function.
Note
Though the OSD adjustment lock function is activated, you can still adjust the brightness and contrast,
and adjust Customized Key ( ) using the Direct button.
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