You aren't alone. I don't see it either. I am not a PHP programmer but I configure PHP modules (isapi.dll or fastcgi) all the time. When the server reads the web page, it intercepts any program code by looking for stuff like ?>/P in the page and runs it. PHP modules are really mini programming languages that run the code in a web page.
What is not explained here is what does the program code do with the data it collects, where does it put it, and what is someone writing a NOF site supposed to do with it. I don't see anything in the comment lines explaining any of this.