Is there a (purposefully) hidden code in this group of digits, or is it just a random string? (religion.blogs.cnn.com)
The Japanese version had a lot of extra hidden codes, though most of them did fairly little; most simply displayed a strange message. (hardcoregaming101.net)
This can be achieved through the silent downloading of malware, through dodgy browser extensions and even through hidden code on websites. (fortune.com)