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Make sure they don't have different versions. If you're using the inbuilt Mac one you may find that it won't connect for that reason.
I found an awesome site that could probably help you out:http://www.google.com/Seriously, it's not that hard.
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2. Use any VNC client to access these computers.
VNC client/server list
Forward your ports to access from behind a router
What is your IP address?
http://www.google.com/
Seriously, it's not that hard.