I know that security issues have/are discussed a lot regarding OS X and that, while Unix is prone to problems (right?) OS X has a built in Firewall which can be implemented using BrickHouse, FireWalk, etc. (Note: I have BrickHouse set to block just about every hack and scan that the SW allows). Also, I have dynamic DSL which is only reset (new IP address) when I reboot my Mac or log out (Iguess?). That all being said, as "added" security I also never leave Entourage and Explorer running when I'm away from my Mac (ie., sleep mode). Is this necessary, lame, a good idea, what? What do you folks do? Does leaving these apps (or other Internet apps) running give a back-door to hackers or look-e-loos? Of course, I'd rather just leave all my apps running so I don't have to launch crap except for when I FIRST boot up, but I'm really sensitive to security issues. Can someone educate me (and others) here about Mac security, firewall issues, port scans, etc. Incidentally, I use(d) Intego Netbarrier on the OS 9 side (their X version is still in development); do I need a firewall SW on the Classic side under X? Help!