The most effective tool for blocking cookies from your machine is Netscape Communicator or Netscape Navigator 4.0x. Internet Explorer 3.0x also allows selective blocking of cookies but version 4.0x is not as strict in this area. The options to allow all or deny all cookie are relatively clear. The intermediate option is to block cookies that do not originate from the current domain. The option to warn before accepting cookies is useful when you are developing a site that uses cookies but become annoying when you are browsing the internet.
Some servers are able to use cookies to gather information about visitor behaviour.
When these are incorrectly configured a single page can set a cookie for every graphic. In addition to web browsers, there are a number of shareware products that allow you to control the contents of your cookie file. Another poplar method is to replace your cookie.txt file with a folder of the same name. This prevents any cookies from being accepted.