at home I use Apple Remote Desktop on several Mac Mini's that I use as a rendering cluster for my 3D programs since I don't have them plugged into monitors. But that's also Apple...
I recomend SSH. You won't be able to do anything graphical, everything is command prompt, but it is the best option since until Telnet, SSH uses encrpytion.
I have SSH enabled on the XServesr to log in from home or the road and get files or restart something if a service fails and I don't feel like going to the office. Infact I can log in from my blackberry...that is until they shut off service in a few days thanks to the SCOTUS ruling...
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