What is a click other than a "redirect" from one page to another? Add the appropriate parameters in the HTTP call and you are done. There is no need for actual user interaction for an HTTP call to be considered a "click".

Take a look at the screenshots: You will see that the redirects are URLs that you would "click" as a user to see an ad.

The clever part is that the "clicks" come from a wide variety of IPs, wide variety of browsers, and on different times.