So I've decided to use ipfw (the firewall in Panther) to protect Windows XP running on Virtual PC 6.1 with Shared Networking. Whenever Virtual PC is running I get this warning whenever I go to the Firewall panel in the Sharing preference pane in System Preferences: If I run "sudo ipfw list" in the Terminal I see that the following lines are added to my list of firewall rules. I assume this Virtual PC is modifying the firewall in order to share my powerbooks network connection, and since the firewall GUI in panther is just a front end for ipfw and can't recognize any complicate rules, it thinks I must have some other software installed that's modifying my rules. Could someone PLEASE give some more info on what these lines mean and how secure is Virtual PC because of them? Should any additional precautioons be taken on the Virtual PC side to secure it from the outside world?Thank you!