Network Monitor - how?

Question

Monitors

Hi guys. We work for an IT company. It became boring to share pictures, articles through social networks, and there was a desire to make one common network monitor for two PCs.
We have. PC - a set of any OSes, a couple of monitors, routers, Wi-Fi routers, switches, 2 servers.
From all this, we need to do this. What would be in the distance from our 2 places, a monitor hung on the wall. On which it would be possible to throw off pictures, articles and various crap, to two users at the same time, each from their own computer. And in general, it would be good if it would be implemented as usual dragging from one monik to another.

Answer 1

It means that it would be like a third monitor for two computers. That is, it is elementary to drag a picture or folder there. Browser or something like that, for sure there is something like that.