The error 404 is, if you like, the bane of the web user's life, but it is also what makes the web work because all the systems before were very big and cumbersome and they had systems of making sure that every link had an end.

BBC: NEWS | Technology | Net guru peers into web's future

The "warhead" names appeared as links, most leading to 404 error messages of pages not found, but some leading to pages of raw programming code.

CNN: Anonymous threatens Justice Department over hacktivist death