Well, I managed to talk to TONMO for a few minutes, so it does work with 2 people... I had some weirdness where I left "ghost logins" when I just closed the window instead of using the logout button or "quit," but when I quit my browser (and the associated java_vm) it closed those connections. Tony says his doesn't do this, so it may be something about my OS or some such (debian pure64/amd64 linux + firefox + blackdown/sun java j2re1.4.2). Shrug.
I get a blank grey screen for about 20 seconds (although the status bar says 'Applet initialized' if you mouse over), then a black screen that says in red: Connection to [...] failed! MELANGE debug: java.net.NoRouteToHostException: Operation Timed Out