Hello,
Yes ArraySync is designed to do exactly what you describe, and yes there is a demo version available! Visit the ArraySync homepage to find the 10-day trial download (this is not possible with Mac App Store version).

That's great. So to use ArraySync do I have to set up a local network for ...

Hi,

I am producing a 4 screen video installation as part of my final year college project and just wondering whether ArraySync would work for what I'm trying to do. I need to be able to play 4 separate videos on 4 iMacs and for them all to play in sync.

Would it be possible to get a demo version ...