Run two motherboards from one supply has a cool article written in 2006 about a setup they made to run two motherboards using the same power supply.

The article goes through all the parts used on the setup and has some cool pictures. To make a system like this all you would have to do is fab some sort of case that has all the ports for both PCs.

Something to check out if you run two systems, why have two cases, supply and fans when you can just plug in one?

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