Information about cookies and other passive tracking methods
A "cookie" is a small file that a web server sends to your web browser to help that site remember information about your preferences.
"Session" cookies are temporary files that are deleted once you close your web browser or turn your computer off. Session cookies are used to improve navigation on web sites and to collect aggregate statistical information. This site does not use session cookies.
"Persistent" cookies are more permanent files that are stored on the hard drive of your computer and stay there unless you delete them. Persistent cookies store information on your computer for a number of purposes, such as retrieving certain information you have previously provided (e.g., login passwords), helping to determine what areas of the web site visitors find most valuable, and customising the web site based on your preferences. This site uses persistent cookies.
"Internet tags" (also known as single-pixel GIFs, clear GIFs, invisible GIFs, and 1-by-1 GIFs) can be used to tell the web server information such as the IP address and browser type related to the visitor's computer. We do not use Internet tags at this site.
Responses to surveys conducted on this site are pooled anonymously to provide aggregate results.
"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. This site uses navigational data.