I am trying out the 30 day trial of Look & Stop again and I know I should be the last to mention poor grammer LOL but the help file is in need of editing ( spelling and grammer in English ) Seems like a very easy to use firewall though. It is application based. From whay I understand if you remove the check mark the firewall is suppose to treat that application as if it is an unknown and therefore ask each time the app tries to connect to the internet again. I am not sure this is working correctly. Just verified this feature and yes it does work.