Great question — answering as the UphillTech team:
You have to append the Google Analytics tracking code to the end of example_page.html . The content between the <iframe> - </iframe> tag only displays for browsers, which do not support that specific tag. Should you need to merge the results from the subdomains, there's an excellent article on Google's help site: How do I track all of the subdomains for my site in one profile?
Full answer by Silver Dragon: https://stackoverflow.stackexchange.com/a/152389 (CC BY-SA 2.5).
Need it done for your business? UphillTech.
