Samsung SyncMaster 460UTn2-UD2 User Manual page 63

Security
Safety Lock
Lock the on-screen menus.
Button Lock
Lock the buttons on the display device.
OSD Display
Source OSD
Select whether to display a message when the Source is changed.
Not Optimum Mode OSD
Select whether to display a message when a non-compatible mode is selected.
No Signal OSD
Select whether to display a message when there is no input signal.
MDC OSD
Select whether to display a message when settings are changed by the MDC.
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To unlock the menus, set Safety Lock to Off.
To unlock the buttons, set Button Lock to Off.