c# qr code generator code project Lesson 4 in C#.NET

Creating QR Code ISO/IEC18004 in C#.NET Lesson 4

Lesson 4
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QR Code 2d Barcode Reader In Visual C#.NET
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Logging On and Off Windows XP Professional
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Bar Code Reader In Visual C#
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Printing QR-Code In VS .NET
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QR-Code Creator In Visual Studio .NET
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The Purpose of Fast Logon Optimization
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Windows XP Professional includes a feature named Fast Logon Optimization. Enabled by default, this feature allows existing users to log on by using cached credentials instead of waiting for the network to become fully initialized before allowing logon. This features enables faster logons from the user perspective. Group Policy and other settings are applied in the background after logon and after the network is initialized. Fast Logon Optimization is always turned off in the following situations:
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The first time a user logs on to a computer When a user logs on using a roaming profile, a home directory, or a user logon script (you will learn more in 7)
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How to Log Off Windows XP Professional
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To log off a computer running Windows XP Professional, click Start and then click Log Off. Notice that the Start menu, shown in Figure 1-9, also allows you to turn off the computer.
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Figure 1-9
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The Start menu provides a way to log off Windows XP Professional.
Features of the Windows Security Dialog Box
The Windows Security dialog box provides information such as the user account currently logged on, and the domain or computer to which the user is logged on. This
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1
Introduction to Windows XP Professional
information is important for users with multiple user accounts, such as a user who has a regular user account as well as a user account with administrative privileges. If a computer running Windows XP Professional is joined to a domain (or if the Welcome screen is disabled even when the computer is a member of a workgroup), you can access the Windows Security dialog box by pressing CTRL+ALT+DELETE at any time while Windows is running. If the Welcome screen is enabled, pressing CTRL+ALT+DELETE activates Task Manager instead. Figure 1-10 shows the Windows Security dialog box, and Table 1-2 describes the Windows Security dialog box options.
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Figure 1-10 Table 1-2
Use the Windows Security dialog box for many security activities.
The Windows Security Dialog Box Options
Description Allows users to secure the computer without logging off. All programs remain running. Users should lock their computers when they leave for a short time. The user who locks the computer can unlock it by pressing CTRL+ALT+DELETE and entering the valid password. An administrator can also unlock a locked computer. This process logs off the current user. Whether the Windows Security dialog box is available or not, you can also press WINDOWS KEY+L to immediately lock the computer. Allows a user to log off as the current user and close all running programs, but leaves Windows XP Professional running. You can also log off Windows by choosing Log Off from the Start menu. Allows a user to close all files, save all operating system data, and prepare the computer so that it can be safely turned off. You can also log off Windows by choosing Turn Off Computer from the Start menu. Allows a user to change his or her user account password. The user must know the current password to create a new one. This is the only way users can change their own passwords. Administrators can also change the password.
Option Lock Computer
Log Off
Shut Down
Change Password
Lesson 4
Logging On and Off Windows XP Professional
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Table 1-2
The Windows Security Dialog Box Options
Description Provides a list of the programs that are running and a summary of overall central processing unit (CPU) and memory usage, as well as a quick view of how each program, program component, or system process is using the CPU and memory resources. Users can also use Task Manager to switch between programs and to stop a program that is not responding. You can also access Task Manager by right-clicking any open space on the taskbar and clicking Task Manager. Closes the Windows Security dialog box.
Option Task Manager
Cancel
Practice: Creating a Password Reset Disk
In this practice, you will create a password reset disk. Complete either Exercise 1 or Exercise 2. If you are working on a computer that is a member of a domain, use the steps in Exercise 1 to create the disk. If you are working on a computer that is a member of a workgroup, use the steps in Exercise 2 to create the disk. For either exercise, you will need a blank, formatted, 1.44-MB floppy disk.
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