Set cookies on theregister.com domain that might, if you are lucky, enable hidden features of the site.
Direct link: https://www.theregister.com/Page/redpill.html?set:foo:bar
'test_' is always added as a prefix to the cookie name, it will be set on 'theregister.com' and expire in 7 days.
Clicking ® (in the log entries below) toggles that cookie. Pressing ! (shift + 1) will toggle the most recent cookie.