They can find out what web sites you have visited, what documents you have used, what programs you have run, what music and movies you have played, and other activities. In addition, when you are on the Internet, you may have downloaded intrusive devices such as cookies, bugs, and spyware. These devices may strike at any time on your PC. These problems raise not just privacy concerns but serious security issues as well. History Sweeper is a program that cleans online history.