In English....
Basically, the router acts as a hardware firewall. When you establish an Internet connection,
your request for information, surfing, has a leading and a trailing packet assigned to it by your
system. You router checks every packet coming into your computer for these packets. Bogus
packet, not from your computer, are ignored ( outside hackers trying to get in ). Surfing the net, you may become infective. Software will be installed on your PC w/out you knowledge. It will transmit information from your pc to whoever created the virus. Thus, it has the correct
packets and passes thru your firewall.
The additional software < BlackIce,... > flags you when your PC trying to sending packets from applications not authorized to do so.
Okay.
Long winded.