VDI for home use?

I've got two boys at home that are constantly fighting over the use of my computer. At the moment they are young enough that they aren't playing games that need lots of computer resources. Mostly, one of them is playing games like Runescape and its Moparscape clones. The other plays some more advanced games like Flight Sim X.

After reading this blog site about building a $200 PC I got to thinking if it would be possible to build a cheap PC for the boys and have one of them use a real PC and the other use a XP virtual machine using some kind of cheap windows terminal to connect. I guess the terminal would be the key thing. If it is too expensive you might as well build another cheap PC.

I'll do some more research and post my findings.