yeah something like that I guess..

I think that could be written in c/c++ and easily hidden somewhere in the windows\system or system32 folder..

give it a nice name like lapsrv.exe and noone will ever figure out it has the intention it has..

the only trouble is: If the thief steals the laptop and first thing he does is installing the OS from scrach (fdisk / format)

laptop vendors could build a hardware feature to do this kind of thing..

but what about firewalls.. the traffic could easily be stopped..