Samsung SyncMaster 275TPLUS Quick Manual page 18

Kensington Lock
The Kensington lock is a device used to physically fix the
system when using it in a public place.
(The locking device has to be purchased separately.)
For using a locking device, contact where you purchase it.
Stand Stopper
Remove the fixing pin on the stand to lift the monitor up and
down.
See Connecting Cables for further information regarding cable connections.