I'm wondering if anyone knows about how myfonts.com keeps track of page views for their webfonts that they offer. If you've ever tried to buy a font for the web from them - they have a pricing scale based on how many page views your site gets. The more page views the more the font costs. They also will give you a warning by email when you are getting close to your page view limit.
You can see here by this link that you get a JS tag to put in your site with the font you bought:
If I wanted to make something on a small scale like this what do I need to learn and research? What sort of technology is involved in making this happen?