Dual monitor + mirror monitor setup?

[mystvearn]

Hi,

I have a PC which has a dual monitor setup. I have obtained a third backup screen. I was wondering if this screen could be a mirror screen for one of the monitors. I have students which come to my room all the time, so it is easier if I can hook the monitor near the desk rather than they stretch their heads or come over cramping the space there.

The monitor has to be mirrored as I can see what I'm doing on my side and they can see on their side.
Monitor (connection)
1st monitor: Dell S340L (HDMI)
2nd monitor: Dell E190S (VGA)
3rd Monitor: Acer x193W (this monitor will be the mirrored monitor) (DVI)

 

[AddRAM]

My teacher just hooked his PC up to a projector, shined it right at the front wall screen, all the students just looked forward. Did what he taught right on our PC.