After watcing a recent "The Real Hustle's" episode, I wonder how exactly is it for them to do what they did.

They used someone's else's unsecured wireless network by having their laptop within its range. I myself use the similar unsecured wireless network myself & allow my nephew to use my wireless network to browse Internet (who only lives 3 houses next to me).

Now, in "The Real Hustle", they showed that it wasn't JUST possible to use someone else's bandwidth & browse Internet on their own laptop, but ALSO were able to see exactly the website other person is browsing at that very moment & could see this other person's mouse movement & keyboard stroke, etc. ....... LIVE.

How exactly could this be possible, since so far, my understanding was that me allowing my nephew to use my bandwidth could ONLY be used by him to browse the Internet but NOT to see my "LIVE browsing".

Could anyone enlighten me further towards it ???

as far as i know it isn't possible to see what someone else is doing on their pc without a trojan or something like that being installed on their computer.
i think you can see what websites someone is looking at and stuff on an open wireless network with software or whatever.