Cookies
Which cookies the site uses and why.
Essential cookies
The site uses a session cookie to keep you signed in and a security token to prevent forged requests. Sign-in and forms do not work without them, and they expire with the session or when you sign out.
Analytics and tracking
By default the site uses no third-party analytics or tracking tools.
Advertising
If the administration enables ads on article pages the ad provider may set its own cookies. Ads never appear in learning or exam pages.
Control
You can delete or block cookies in your browser settings, but this may prevent you from signing in.