Norton Security does that automatically.......sort of a "firewall for dummies" (which is what I need most of the time!) It knows when changes are made, and if it's not sure permissions should be granted, will pop up and ask if you want it permitted or blocked and gives you the option to select if it's just this time or always. That's what it did the first time it saw Poser 5 trying to "cruise the net". I set it to "block it....always" :)