The history, the architecture, the major players, the trivia, the technology -- what do you really know about Windows? You have sewn up every Windows hole on your systems and tattooed the Start icon on you arm. But how much do you really know about the Redmond OS? Test your mettle with these 20 questions designed to separate the newbies from the seasoned operators. Who knows? You might learn something.1. The Windows OS architecture is highly modular and built on two layers. One layer is called User Mode. What is the other layer called?a. The Hardware Abstraction Layer (HAL) b. Hyper-V c. Kernel Mode d. Executive Services Take the Windows admin IQ test IT Skills and TrainingCareers