NAT and Multibul VNC instances....
Mon Jul 21 03:31:01 2003
> How can I force the viewer to look for a VNC server on a specified port
"This will bring up an initial connection prompt, where you can type in
the name or IP address of the VNC server you want to connect to, and
optionally the display number of the desktop there."
Where "display number" is port - 5900.
This is also explained (better than the new docs, IMHO) in the "Old FAQ":