I'm a bit confused

The docs (Novell Documentation) indicate that I would need the following ports enabled if I used a firewall:

PC (say, at home) to my private LAN: 5950
and vice versa (if not using a stateful firewall)

But what if I'm using the remote proxy service. That section of the doc says it listens on 5750

So if I wish for the administrator to remote control a PC that's behind a NAT firewall, how does that work?

or do I need to have the user request remote control in the case of behind a NAT?

(that docs are so unclear as to how to do things with the remote proxy).