Their "layer cake" emulation module is the glue that holds everything together.
"Over 5 million people around the world use top apps like Angry Birds Space, Kik Messenger, Where's My Water and more on their laptops with BlueStacks. It took 10 engineers two years to build the complex "LayerCake" technology that enables this to happen – but you get to experience it free while in beta. You can download App Player now at BlueStacks.com."
Download App Player from BlueStacks.com.