Basically, the rule says only 'root' can use these ports for servers. 'root' also has permission to read and write any file on the machine. 'root' is also known as the 'super user', which is a cool name, but not nearly as cool as the title I would bear after I finished setting up the webserver: 'webmaster'. So, when I wanted to set up the server, some people were nervous about running the web server as 'root' because if there was a security hole, it might allow someone to break into our system as root. This would be bad. So, I didn't run it as root.
Plexus, the server we were running, by default used port 8001 if it wasn't running as 'root' and this is what I did. So, the SIPB web server stayed exclusively on port 8001 until we switched to Apache.