Samsung SP-M221 Owner's Instructions Manual page 28

2-10-3. Connecting Video Devices (Monitor, TV, etc.) (SP-M270, SP-M300 Models Only)
You can view an image on both your projector and a separate monitor at the same time.
Make sure that your PC and projector are turned off.
1. Connect the [PC IN] terminal at the back of the projector to the D-Sub (PC, VGA) terminal of your PC using a D-Sub cable.
2. Connect the [PC OUT] terminal of the projector to the D-Sub terminal of a monitor using a D-Sub cable.
- When connecting a monitor using the [PC OUT] function, make sure to connect your PC to the [PC IN] terminal.
- The video on the monitor connected to the [PC OUT] terminal will be normal even if your projector displays a blank screen.
- The [PC OUT] function will not operate in standby mode.
2-10 Installation and Connection