Samsung 400Pn, 400P Owner's Manual page 96

Available Mode
OSD Description
MAGICNET Move to the MagicNet OSD screen.
Move to the Multi Control OSD screen.
MDC
Set the Safety Lock function.
LOCK
1) Lock On
: It will be locked on.
2) Lock Off
: It wil be locked off.
MagicNet
: PC / BNC / DVI : AV
When setting the Lock function, you can only
operate power and lock buttons on the remote
control and set.
The preset password on the monitor is "0000".
: S-Video : Component : MagicNet
Play
1) Lock On
2) Lock Off