Hamachi is a downloadable program that tricks computers into thinking they're on a LAN, connected to one another in the same room, vastly simplifying online connections. It gives you an alternate IP, and everyone in the room (free rooms allow you and 4 others) 'share' the IP
I can see it, I join, get to the attempting to join/connect usually sits there for awhile and after a point music stops playing and I ultimately have to start up task manager and kill the program.
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Edit: Happens both in windowed and fullscreen.
Edit: Or wait till we find an alternate for Hamachi that works for both MAC and PC