Only a few hours separate from the start of the 2015 Le Mans Race and with Porsche occupying the entire podium during qualifying, the Zuffenhausen people look determined to make the most out of their second Circuit de la Sarthe race after returning to Le Mans.The 919 Hybrid racecar has been seriously reworked for 2015, now being the only LMP1 prototype that runs in the 8MJ energy class, the highest one available.Three cars and nine works driver, this is Porsche's plan. But how will those racers interact with their machines?The annotated image above, which comes from BBC Autos , offers us a pretty good answer to that question. It's all about buttons, buttons and switches.In LMP1 endurance racing, traction control is split between the front and rear axles. The driver can choose the level of intervention for each one using four dedicated buttons.The controls are not all just for the machine though. Need to replenish your mana? No problem, the "Drink" button can do that for you.The pair of buttons easiest to access is also worthy of being mentioned, including the passing boost and the flashers.If you hover over the buttons and switches, explanations on their functions will pop up, telling you what each one is used for. You'd better know your racecar before the marathon begins.