"Persistent" cookies are more permanent bits of information that are placed on the hard drive of your computer and stay there unless you delete the cookie. Persistent cookies store information on your computer for a number of purposes, such as retrieving certain information you have previously provided (such as passwords), helping to determine what areas of the Web site visitors find most valuable, and customizing the Web site based on your preferences on an ongoing basis. Persistent cookies placed by this site on your computer may hold personally identifiable information, but only if you have registered or have otherwise consented to the retention of personally identifiable information you have provided at the site. Otherwise, our site's server only knows that an unidentified visitor with your cookie has returned to the site.

You can set your browser to accept all cookies, to reject all cookies, or to notify you whenever a cookie is offered so that you can decide each time whether to accept it. To learn more about cookies and how to specify your preferences, please search for "cookie" in the "Help" portion of your browser.

A site may use Internet Protocol (IP) addresses. An IP address is a number assigned to your computer by your Internet service provider so you can access the Internet and is generally considered to be non-personally identifiable information, because in most cases an IP address is dynamic (changing each time you connect to the Internet), rather than static (unique to a particular user's computer). The IP address can be used to diagnose problems with a server, report aggregate information, determine the fastest route for your computer to use in connecting to a site, and administer and improve the site.

"Internet tags" (also known as single-pixel GIFs, clear GIFs, invisible GIFs, and 1-by-1 GIFs) are smaller than cookies and tell the Web site server information such as the IP address and browser type related to the visitor's computer. Tags may be placed both on online advertisements that bring people to the site and on different pages of the site. Such tags indicate how many times a page is opened and which information is consulted.

"Navigational data" (log files, server logs, and clickstream data) are used for system management, to improve the content of the site, market research purposes, and to communicate information to visitors.