What ports do I need to open in a home router to support Screen Sharing?

I'm trying to support my 88 year-old dad who has totally messed up his iMac. We're both running 10.6.8. I went ahead and bought the Easy Remote Desktop app from the app store, since I don't need a heavy-duty admin tool, just to see and to remotely manipulate his screen. I tested it on my home LAN with my wife's computer and it works great. I did have to find out her IP address, and she did have to turn on Screen Sharing services open to just me first. The downside for Screen Sharing vs. Remote Administration is that there is no announcement that you're there.
So I'm thinking that I can just type in my dad's IP address. Of course he has a DSL router and probably has a DHCP address, so I found out about Dynamic DNS, and located a free Dynamic DNS service. I've already established (the functional equivalent of) a static IP for myself with this service, and I'm thinking the next step is to talk my dad through doing the same for himself. Then the next hurdle I think would be to talk him through opening the Screen Sharing service on his Mac, and to add me as a user. But the final hurdle I think would be to open inbound ports for Screen Sharing from my IP address. Since Screen Sharing is a native Mac OS function, I figure this is the place to ask that question. And to ask if I'm on the right track here...

Screen Sharing uses port 5900.
However, I'm going to suggest that you use TeamViewer.com as it will deal with all the networking issues much more easily and without needing to worry about opening ports in your router.

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<removed_by_moderator>
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>
madhu singh wrote:
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