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HKEY_LOCAL_MACHINE This root key contains all the data for a system s non user-specific configurations This includes every device in your PC, including devices that you have removed HKEY_CURRENT_CONFIG If values in HKEY_LOCAL_MACHINE have more than one option, such as two different monitors, this root key defines which one is currently being used Because most people have only one type of monitor and similar equipment, this area is almost never touched

In Lab Exercise 201, I recommended that you get used to taking notes and drawing pictures Thanks to the wide popularity and availability of digital cameras (even most mobile phones now include a camera function), you have another excellent way to record the con guration of computer systems and the steps taken during disassembly, repair, and assembly A digital camera can be a handy tool for supplementing your trusty pencil and paper

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The CPU can t magically or otherwise automatically know how to talk with any device, but rather needs some sort of support programming loaded into memory that teaches it about a particular device This programming is called basic input/output services (BIOS) The programs dedicated to enabling the CPU to communicate with devices are called services (or device drivers, as you ll see later in the chapter) This goes well beyond the keyboard, by the way In fact, every device on the computer needs BIOS! But let s continue with the keyboard for now Bringing BIOS to the PC A talented programmer could write BIOS for a keyboard if he or she knew the keyboard s codebook keyboards are pretty simple devices This begs the question: where would this support programming be stored Well, programming could be incorporated into the operating system Storing programming to talk to the hardware of your PC in the operating system is great all operating systems have built-in code that knows how to talk to your keyboard, your mouse, and just about every piece of hardware you may put into your PC That s fine once the operating system s up and running, but what about a brand-new stack of parts you re about to assemble into a new PC When a new system s being built, there is no operating system! The CPU must have access to BIOS for the most important hardware on your PC: not only the keyboard, but also the monitor, the hard drives, optical drives, USB ports, and RAM So this code can t be stored on a hard drive or CD-ROM disc these important devices need to be ready at any time the CPU calls them, even before installing a mass storage device or an operating system The perfect place to store the support programming is on the motherboard That settles one issue, but another looms: What storage medium should the motherboard use DRAM won t work because all the data would be erased every time the computer was turned off You need some type of permanent program storage device that does not depend on other peripherals in order to work And you need that storage device to sit on the motherboard.

Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)

Windows uses virtual memory as an extension of system RAM Virtual memory is a section of hard drive space that s used as a temporary storage box for running programs When the PC starts running out of real RAM for instance, when one program needs more resources the system moves inactive programs from RAM to the virtual memory area on the hard drive, thus opening more space in RAM for programs that are currently active This process is fully automated, requiring no user intervention All versions of Windows use virtual memory, although they may call it different things, such as the swapfile or pagefile

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