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A device driver is a file stored on the PC s hard drive that contains all the commands necessary to talk to whatever device it was written to support All operating systems employ a method of loading these device drivers into RAM every time the system boots They know which device drivers to install by reading a file (or files) that lists which device drivers the system needs to load at boot time All operating systems are designed to look at this list early on in the boot process and copy the listed files into RAM, thereby giving the CPU the capability to communicate with the hardware supported by the device drivers Device drivers come with the device when you buy it When you buy a sound card, for example, it comes with a CD-ROM that holds all the necessary device drivers (and usually a bunch of extra goodies) The generic name for this type of CD-ROM is installation disc In most cases, you install a new device, start the computer, and wait for Windows to prompt you for the installation disc (Figure 527) There are times when you might want to add or remove device drivers manually Windows uses a special database called the registry that Figure 527 Windows asking for the installation disc stores everything you want to know about your system, including the device drivers You shouldn t acYou can also access the Decess the registry directly to access these drivers, but instead use the veneravice Manager by right-clicking ble Device Manager utility (Figure 528) My Computer and selecting Using the Device Manager , you can manually change or remove the Manage When the Computer drivers for any particular device You access the Device Manager by openManagement dialog box comes ing the System applet in the Control Panel; then select the Hardware tab and up, click on Device Manager click the Device Manager button Make sure you know how to access the.

computers, in-business networks, mobile computers, and home PCs to share information worldwide Today we even have cell phones, personal digital assistants (PDAs), and other devices that we can use to connect to the Internet and access e-mail, download MP3s, and do other tasks Because nearly everyone wants access to the Internet, implementing and troubleshooting Internet connectivity is a PC technician s bread and butter The CompTIA A+ Essentials (220-701) exam recognizes this and tests you on the details of installing and con guring a connection to the Internet It may be a legacy dial-up analog modem used to connect to an ISP through a phone line, or a broadband cable modem using the local cable company as the provider In this chapter, you will rst explore various Internet connectivity options, and then install and con gure your very own connection to the Internet

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Let s now group some related elements of the form and also highlight the input fields when they receive focus. For grouping the form elements and applying captions to them, we need to use two HTML elements: Fieldset and Legend: The <fieldset> tag is used for grouping a few form elements together. It draws a box around the grouped elements. The <legend> tag is used for defining a caption for the form elements that are grouped by fieldset element.

Device Manager You ll see lots more of the Device Manager as you learn about different types of devices in the rest of the book

BIOS, BIOS, Everywhere!

As you should now understand, every piece of hardware on a system must have an accompanying program that provides the CPU with the code necessary to communicate with that particular device This code may reside on the system ROM on the motherboard, on ROM on a card, or in a device driver file on the hard drive loaded into RAM at boot BIOS is everywhere on your system, and you will need to deal with it occasionally

Power-On Self Test (POST)

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