Apart from your temporary internet history folder, which is easily erased, all your online activity is recorded in a hidden index file, which is only accessable with specialist tools.

Index.dat files are hidden on your computer hard drive and contain tracks of all your online activity – where have you been on the internet, what sites you visited, list of URL-s, files and documents you recently accessed. The index.dat runs as long as a user is logged on in Windows and it’s role is to help speed up query responses.