Some browsers don't handle them at all. And some browsers that should handle cookies don't , or they don't under certain circumstances. Make sure your cookies are not disabled. The Web site may deliver one or more cookies to the client. The client stores cookie data in one or more flat files on its local hard drive.
Cookies can only store data that is provided by the server or generated by an explicit user action.
Cookies can be used to store any information that the user volunteers. They cannot be used to gather sensitive information. The file name is different for each platform. A Web site may set an expiration date for a cookie it delivers. If no expiration date is specified, the cookie is deleted when the user quits the browser.