[all variants] Connecting two computers without ethernet or wi-fi?

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http://ubuntuforums.org – Hi, I posted a similar question a few hours ago, but I think it's better to put it a bit differently. I have two computers, a laptop and a workstation, both running linux (Ubuntu and Fedora). For some reasons, it's handier for me to work from the laptop, accessing the workstation only from remote. At present, I have to connect to the workstation using a very complicated system that implies VPN + ssh passing through the internet. It works, but it would be far easier and faster if I could set up a direct connection between the two computers. Unfortunately, I can't use the ethernet ports or wi-f (HowTos)