He doesn't need a VPN service, probably he made a confusion between VPN and Remote Desktop, he need TeamViewer...
I need something like teamviewer, but teamviewer is asking for money now. Windows Remote Desktop , I still have to try. Was looking for a program like team viewer, but completely free or for cheap.
Well, from what I know TeamViewer is free for non-profit organizations...
Anyway, if isn't free and you need it for personal use, you can crack it.