Yeah, I didn't know about that version of vnc for the longest time
either. It also has a gateway like feature, where you can connect to a
pc behind a firewall, from a pc also behind a firewall, by going
through a pc running the Ultra@VNC gateway program. Unforntunately it
doesn't seem to be near as stable as it's alternatives. I've never had
any stability problems with realvnc or tightvnc, but the ultravnc
viewer and gateway programs seem to lock up far too often.