Problems with Cookies
Before using cookies in an application, you should be aware of the problems associated with cookies. For these reasons—and others that may crop up in the future—you should be careful to design your web pages and CGI programs so that cookies are entirely optional.
For example, if you're using cookies to store user preferences, you should use a default set of preferences if cookies are not available. You must code defensively.
Cookies Are Ephemeral
As I've mentioned throughout this hour, cookies are ephemeral. Cookies can be deleted from the user's system, edited by the user, or simply thrown away by the browser for no apparent reason. A browser can accept the cookie, use it for a short time, and then simply forget it for ...
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