Remote Desktop Win->Linux, different countries
I have a sister living in Jersey who's using an old Dell laptop of mine with Ubuntu 8.04. She knows how to switch it on, log-in and use Firefox, but I'd like to be able to remotely access the laptop to perhaps fix a few things and show her how to update/install/use software etc...
I use XP at home (Linux still doesn't have drivers for some of my hardware yet), so am looking at remote desktopping between OS's somehow. At the moment VNC appears to be the best free offering, but I think I'll still have to get some ports open on her ADSL router to use it.
Ideally, I'd like something that is free, works on both XP and Linux, and is easy for a noob to set-up on Linux and through routers.