A cookie is a set of data that a Web site server gives to a browser the first time the user visits the site, that is updated with each return visit. The remote server saves the information the cookie contains about the user and the user's browser does the same, as a text file stored in the Netscape or Explorer system folder. Not all browsers support cookies. Cookies store information such as user name and password and what parts of the site were visited; this information can be updated with each visit. The browser only shares each cookie with the server that originated it; other servers can only read their own cookies. Netscape can be set up to alert the user when a cookie is being sent so the user can accept it or not, by means of the Network Preferences window. There are also downloadable applications that eat cookies such as Cookie Killers, Cookie Monster (Mac), and Kill Cookie Batch File (PC).