It uses a special event tracking method for IE to make sure it blasts about 99.5% of all pop-ups. It was created to remain simple yet block pop-ups powerfully. It even blocks spyware and messenger service pop-ups.You can choose if you want it to run in your start up and be notified when a pop-up is blocked. If you want to allow a pop-up you can hold CTRL or add a URL to the allow list. If you think you have had an important pop up blocked you can find out past blocked window information.