If you don't think it can be tracked, heres a pretty simple way of showing you it can be.

Start a transfer, let it run for 5 mins so it starts going well and starts actually downloading for a few mins.

Then click start, run, type CMD and hit ok.
Now type NETSTAT and hit enter.

You can now easily see everyone that you are connecting to and everyone that is connecting to you.


There's always a way to track it.