Short answer: It's tracked by IP, so you can't just refresh and increase view counts.

Long answer: Read the Meta Stack Overflow topic here: [How does Stack Overflow calculate the number of views in a question?](http://meta.stackoverflow.com/questions/36728/how-does-stack-overflow-calculate-the-number-of-views-in-a-question/36729#36729) – it goes into much more detail.