Samsung 400Pn, 400P Owner's Manual page 71

A Multiple Display Control (MDC) is an application allowing various displays to be easily and simultaneously
operated on a PC. RS-232C, a standard of serial communication, is used for the communication between a
PC and a display. Therefore, a serial cable should be connected between the serial port on a PC and the
serial port on a display.
2. Main Screen
Click Start > Program > Multiple Display Control to start the program.
Select a set to see the volume of the selected set within the slider.