A typical online form goes from a sales page to an order form. This means that someone on the sales page has to click a link and then wait for the order page to load. In a world where attention is becoming a super rare commodity, page load speed can impact sales.
This hack takes page load speed out of the equation by having the sales page and order form all in one. However, when the page loads for the first time, only the sales page portion displays. Once someone clicks on the call to action link, the order form reveals itself.