There's currently no built-in or simple way either to share your cookies among all the machines and browsers you work with, or to limit access to your cookies if multiple people use the same machine. It should just be there when you check your shopping cart. A third method, which seems the most prevalent on the Web, is the use of cookies to track people's progress through a Web site. Most Web servers can also be configured to record the cookies sent by a browser for a specific request to the site. This means that the log for the server contains the page request, the datestamp, and the unique visitor identity for each hit on the site.
People have problems with cookie use primarily in regard to privacy.
Fortunately, there are ways to prevent such unauthorized intrusions. Because a site is limited to 20 cookies each, which individually can use no more than 4,096 characters, there isn't room to store much sensitive information. In most cases, a cookie entry will contain nothing more than an ID number and a time stamp. To view the contents of your cookie file, open it with any text editor or word processor. You can often open it in your Web browser, which will display it as a text file.