Firstly it's common knowledge that Gnutella is
full of viruses. Most people do not download any programs at all from LimeWire because of this. Secondly, the 192.168.xx.xx IP class is an unroutable private IP class that is usually only used on ethernet networks. Unless you are connected to this private network (either through direct wired or wireless ethernet or VPN), those hosts are invisible to the outside world.
Google for more information. Good luck.
deepblue