Internet Explorer is one of the most used browsers. IE6 still has the largest number of users as compared to the users of other browsers. But with the dawn of the latest browsers IE6 has become more or less obsolete these days because of its lack of features, bugs and repeated crashing.
If you have been a user of IE6, you must have encountered a dialogue box saying that the Internet Explorer has encountered a problem and it needs to close. The dialogue box would then move along with the mouse and it would overlap itself and make the display ugly. These are also exhibited many a times by regular error dialogue boxes on Windows. Mrdoob has created an emulator that gives a similar dialogue box overlapping on any browser. You can try it here.