Not sure. The problem with a traditional "chat" page is that once the java applet loads, it doesn't refresh the page. If the page doesn't refresh, they drop off the list after 10 minutes.
I can't really see any way around this. It'd be great if it were.
I saw something somewhere (I guess it was your DigiChat mod)? Where it opened the chatroom in a frame. Could you have a tiny "iframe" that refreshed - although my browser doesn't support iframes. Many do not. But I guess you could do the page in frames and have one of the frames refresh.
Just thinking out loud. So in theory it works.... but my theorys are sometimes wrong.
Might need to add modifying that on my threads to do list.
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It'd be great if it were.
But I guess you could do the page in frames and have one of the frames refresh. 
