I've been trying to figure out lately how to set up a closed paintchat. It boggles me that this isn't more common (like why hasn't someone built it into an IM program by now? I would pay for an addon that let me open up a private paintchat connection from my messanger window... alas it doesn't exist).

Since I'm not hosting any sites anymore I don't have server access to upload a closed applet and though there seems to be a way to do this with Open Canvas, since it doesn't run on macs (and some of the persons that I'd like to collab with are on the New Evil Empire computers) that doesn't really help me even if I could figure out how to work it.

Does anyone know of anything that would allow this? Maybe a site that offers invite only windows or some program I haven't heard of yet?