Output different sources of video to 3 projectors from a single laptop/computer

Hi all,
We recently got 2 extra projectors fitted to our assembly hall. In total we now have 3 all connected to a single laptop displaying the same content. Is it possible to project 3 different videos to the projectors from a single laptop/desktop. We basically want to have powerpoints running on the side projectors and have video on the middle.

There is a possiblilty of using raspberry pi and hooking it up to the network and have vnc on it. This would allow the computer to remote into it.

But is there a another way.

Thanks in advance for your help.

Has

Multi headed GPU with three outputs or multiple computers would do this easily.

We can only get one computer as the stand can only support one. I will look into the graphics cards with multiple gpu. Thanks for getting back.

also consider the Matrox triple head to go unit...