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FQDN for remote desktop access

I'm trying to have 2 people with remote desktop connections through my firewall. I set a rule in my netgear router for UDP port 3389 to access 192.168.0.5 (or .6 for the other computer) either computer works fine by itself if I type xx.xx.xxx.xx (my static IP address that is in the router settings) in the Computer section of the remote desktop connection box and then put the user name the same as their log in name to windows. First, I keep hearing I need to put the FQDN in the "Computer" box, but I don't know how to figure out what it is.
Since I have two computers, I changed the listening port to 3390 for the second computer. Now is when I believe I need the FQDN to put in the "computer" box, and then the "user name' box will be the windows log in. Am I correct? I know it needs to be something like "computer.fabrikam.com:3390. I don't host my domain from here so I don't know what the "name' is. I tried xx.xx.xxx.xx:3390 (using my method above), but it doesn't work.

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Eraser63

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Sci-Fi-Si

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brianhaug

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Thanks so far, but I still have a problem. It all comes down to the router. I can log in on port 3389 with no problem. If I change the local IP setting (192.168.0.5 or 6) for the rule, I can go to either computer. I log on using myname.dyndns.org:3389 and it works fine. I add a service to my router (netgear FWAG114) with type TCP/UDP, start port 3391 (I've tried 3388 &3390 also) end port 3391. I then try to log on using myname.dyndns.org:3391 and it doesn't work (even with the rule for port 3391 going to the local computer 192.168.0.6). Any thoughts????