Most modern browsers have a private or incognito mode. "InPrivate Browsing" in Internet Explorer, "Incognito mode" in Chrome, and "Private Browsing" in Firefox and Safari all strive to do the same two things: make it impossible for users of the same computer to figure out which sites the browser has been used to visit, and make it impossible for sites to know whether or not a particular user has previously visited them.
Research by Stanford University to investigate the privacy of the "private browsing" feature of many Web browsers suggests that the tools aren't all that private after all, and that many kinds of information can be leaked by browsers when using the mode. The paper is due to be presented at the USENIX security conference.
Normally, browsers are remember a fair bit about where you have been and what you have done online so that it can make your browsing easier: auto-filling Web forms, making it easy to get back to sites you have visited recently, caching frequently loaded content to speed up sites.
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