I Enabled the Built-in firewall that windows XP has and wanted to check it out.. I have a small home network (3 machines). and was going to eather get a router or softwear firewall (zone alarm) to keep it safe... then I found out that win xp has a built in firewall!*I diden't know that* So I went to the Shields-up websight and tested it out... My computer is in FULL STEALTH MODE to all who may try to probe it..... I don't know if this is in the home edition of xp ..but it's in thr pro version...