InfoButtons from foreign maps

By foreign, we mean from another map or VP case entirely. So, yes, you can refer to an infoButton reference that is not even part of this case at all, and it will still work.

For example, from the case 'Welcome to OLab' Info: 

So, this works too. But it has to be on the same server. And note that this ruins the portability of your case - if you export it to install on another OpenLabyrinth server, the infoButton you have referred to will not be exported with it, leaving a broken link. We don't really advocate this lazy man's way of recreating an infoButton.