Unfortunately, I have never heard of PXE so I looked it up on the
Wikipedia. Does this allow you to let multiple computers use the OS running on a central server at the same time?
Edit: I have noticed on my login screen that you can log in using something called XDMCP (X Display Manager Control Protocol). I don't know what exactly that is, but then I saw what the
Wikipedia wrote about it. I
think that this feature will allow you to log in on other Linux machines (that could be a central server) remotely using the user name and password you'd normally use on that computer. This is different from VNC because you can have multiple sessions running at the same time. In human language: two people could be using the same server at the same time! This feature comes preinstalled with Ubuntu, so this could be what you're looking for. The downside of all this: if you want to use Windows on the central server, this won't help you. And you'd have to install Ubuntu on all your guest PCs.