Hi, I am using KERIO firewall 4, and I went to www.scan.sygate.com to prove me firewall, every thing was stealth, except my OS (xp) and my firewall (IE 6). So I want to know if it is possible to stealth them too. Another question is that it detected lookback , can you explain this please? I use dialup connection and an internet tweaker:TWEAKDUN, to accelerate muy downloading. Thanks for your answers.