its suppossed to be a firewall thing,but its not something that comes with the mac its something you download as a trial,i didnt like it because it wouldnt let me connect to limewire and when i hit the allow button it just kept buzzing back asking me wheter i wanted to deny or allow the connection,i could hit allow 50 times and 50 times it would buzz back in and the window wouldnt go away...it doesnt allow me to conect to limewire either even when i told it to,THATS why i want to get rid of it and i read elsewhere that all you have to do is remove the folders from your applicattions and it would uninstall but even after doing that the thing is still working,there must be something hidden but i searched all over the harddrive and couldnt find anything related to netbarrier