Lesson 1 in Visual Basic .NET

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Lesson 1
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Configuring and Troubleshooting Display Devices
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Clicking the Advanced button on the Settings tab opens a Properties dialog box that lets you configure additional settings, including:
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The dots per inch (dpi) setting that Windows uses to display screen elements. The default dpi setting is Normal Size (96 dpi). Changing to a larger setting often helps users who have trouble seeing or clicking on window components such as title bars, scroll bars, close buttons, and so on. Whether Windows restarts or prompts you when you change display settings. The refresh rate that Windows uses to redraw the display. Typically, you should set the refresh rate to the highest setting that the video hardware can accommo date. Higher settings help reduce the flicker-effect on conventional displays. The level of hardware acceleration that Windows uses. By default, the Hardware Acceleration option is set to Full. If a computer is having display issues, reducing hardware acceleration can help you isolate and remedy the problem.
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Note
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In addition to the settings listed, you may see more tabs on the Properties dialog box that are particular to the video adapter installed on a computer. Video adapters that support 3D in particular often provide many additional settings for controlling advanced features for the adapter.
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If a user is experiencing intermittent display problems, such as garbled text, problems with the mouse pointer, or more severe problems, troubleshoot by reducing the level of hardware acceleration.
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Supporting Multiple Displays
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From time to time, users might require more than one monitor on a computer. Users that work with desktop publishing, Web design, or any graphic design programs fre quently need to see more than can be displayed on a single monitor. Windows XP allows you to configure up to ten monitors on a single computer. You can configure each monitor with a different screen resolution and color depth. The Windows XP desktop is spread across all monitors so that you can actually drag windows and dialog boxes from monitor to monitor. Multiple monitor support is especially useful in situations in which users need easy access to multiple applica tions simultaneously.
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7
Supporting Display Devices, I/O Devices, and ACPI
To support additional monitors, you must first install additional video adapters (often called secondary display adapters) onto a computer. Secondary display adapters must meet a particular set of criteria:
They must be Peripheral Component Interconnect (PCI) or Accelerated Graphics Port (AGP) devices. Note that computers support only one AGP device, so addi tional devices would have to be PCI-based. They must be able to run in GUI mode or without using Video Graphics Adapter (VGA) resources (otherwise, the secondary display causes a resource conflict with the primary video adapter when the computer is starting up).
Adding an Additional Monitor to a Computer Running Windows XP To add an additional monitor to a computer, complete the following steps: 1. Verify that the primary display adapter works properly and that the correct driver is installed. 2. Install the additional video adapter and the appropriate drivers, and then plug in the additional monitor. 3. In Display Properties, select the Settings tab. Verify that the appropriate monitors are displayed. 4. Make sure that the physical configuration of your monitors matches the on-screen arrangement, as shown in Figure 7-2. You can control the placement of the sec ondary displays by dragging the monitor icons.
Figure 7-2
Configure the arrangement of monitors to match your physical setup.
5. Select the additional display by clicking the display or by choosing it from the Dis play drop-down list. 6. Select the Extend My Windows Desktop To This Monitor check box.
Lesson 1
Configuring and Troubleshooting Display Devices
7. Configure the appropriate screen resolution and color quality for the new display. 8. Click Apply to enable the new display.
Tip On computers with multiple displays, it sometimes can be hard to tell which display is which. On the Settings tab of the Display Properties dialog box, notice that the displays are numbered. Right-click a display and choose Identify to have Windows display that number on the corresponding monitor.
Potential problems with multiple display configurations include the following:
If the computer has a motherboard with an on-board display adapter, you sometimes must configure that display adapter as the power-on self test (POST)/VGA compatible primary display device. You should not remove portable computers from a docking station while you are using multiple displays. Use the Display properties to disable the secondary display before removing the computer from its docking station. You could also create a hardware profile that does not use the additional display adapters and restart the computer using that profile before removing the computer from its docking station. If Windows does recognize the secondary display, but nothing appears on the monitor, verify that the Extend My Windows Desktop Into This Monitor check box is selected in the Display Properties dialog box. If you have any problems running a DOS application in a multiple monitor configuration, configure the DOS application to run full-screen. The application is then displayed on the POST display device. Make sure that the display with the best DirectX support is the primary monitor. Only the primary monitor can run DirectX applications in full-screen mode and can fully accelerate DirectX graphics.
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