This module was really more of a proof of concept that never became sophisticated enough to be truly useful. I am now marking it as unsupported.
If you are looking for something similar (but much richer), I recommend webprofiler (included with devel) for D8. Suggestions for a D7 equivalent welcome!
Overview
This module tells you which module and function is serving each Drupal url on your site. As soon as it is enabled, you will see a short description of the page's function in the footer of your site, like so:

Have you ever had a client or manager ask you to fix something that you have absolutely no familiarity with? This module will help you begin to figure out where content is coming from.
Features
The module will detect the following:
- the function that serves each page;
- the module that function is provided by;
- the file that function is contained in;
- the line number of the function;
- any arguments being passed to the function;
- for functions provided by core modules, a link to api docs on api.drupal.org.
This will be printed in the footer of any page that shows HTML.
Installation