When you want to solve a problem for someone far away it may be easier to take control of their machines for a while while they watch on their monitor what you are doing.
There are several free services for this:
TeamViewer establishes connections to any PC or server all around the world within just a few seconds. You can remote control your partner’s PC as if you were sitting right in front of it. Find out why more than 15.000.000 users trust TeamViewer!
Fast – simple – safe.
It is interesting to see how a teacher discovered the service through Twitter.