In today's market the dedicated video game systems are only one piece of the equation. In terms of revenue, the largest single platform worldwide for 2007 was the PC. On a global scale, the PC as a gaming platform has maintained strong growth for some time. DFC estimates there are over 260 million PC gamers worldwide, and that should grow to close to 350 million by 2012. Of course, many games on the PC are available for free and it has always been difficult to generate revenue from the PC game market. However, as mentioned, DFC Intelligence estimates the PC gaming market is the largest single game segment on a revenue basis and it is expected to grow 80% over the next 5 years. On a worldwide basis the PC gaming market (including online game revenue) accounted for nearly 30% of interactive entertainment software revenue in 2007. Of course, that does not include all the PC hardware sales that are generated from gamers.