I am brand new to Roll20 and just working on setting something like this up, so I could have some facts wrong below... There are a lot of screens to choose from and you won't have to spend anywhere close to 800 Euros if you are happy with something up to about 28". If you are considering spending that much, you may wish to use a TV as the monitor to get a really big screen: <a href="http://www.rtings.com/tv/reviews/by-usage/pc-monit" rel="nofollow">http://www.rtings.com/tv/reviews/by-usage/pc-monit</a>... Once you have the screen, it looks like you will need: 1) a dummy account for the players 2) to log into the dummy account from a different web browser (see correction below). I log into the GM account in Firefox and log into the dummy player account with Chrome. If you do this, you can hide the user interface on Chrome as described on this page: <a href="https://wiki.roll20.net/Using_Roll20_while_Playing" rel="nofollow">https://wiki.roll20.net/Using_Roll20_while_Playing</a>... and toggle in and out of full screen on Chrome using F11. Good luck. :-) Edit: I was informed in another thread: "You can use the same browser, but if you refresh one window, it will load as the most-recently-logged-in user. You could also use Incognito mode for one of the user accounts."