A picture is worth a thousand words...
The premise of the linked article is to show how one can create a web browser in "one line of code" using a bunch of stuff that more or less comes with Mac OS X. "One line of code" is meant to infer extreme easiness...
It is far from easy. It is a very complex set of procedures, tying together a whole bunch of "code" that has been written for you and presented in a visual environment. Sort of like Yahoo! Pipes, and Max/MSP.
