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TABlE 24-1 Behavior Changes in Windows 7 with UAC When Compared to Windows XP
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When logged on as a standard user, administrators could run administrative tools by right-clicking the tool s icon, clicking Run As, and then providing administrative credentials . Using a standard user account could be a nuisance, especially for technical or mobile users . When a user was logged on as a standard user, an application that needed to change a file or setting in a protected location would fail . If a specific Windows feature required administrative privileges, the entire tool required administrative privileges . When a user was logged on as an administrator, all applications ran with administrative privileges .
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Standard users open administrative tools without right-clicking . UAC then prompts the user for administrator credentials . All users can still explicitly start an application with administrator credentials by right-clicking, but it is rarely necessary . Standard accounts can perform many tasks that previously required elevation, and Windows 7 prompts users for administrator credentials when required . When a user is logged on as a standard user, UAC provides virtualization for important parts of the system, allowing the application to run successfully while protecting the operating system integrity . Windows 7 displays the UAC shield on buttons to warn users that the feature requires elevated privileges . When a user is logged on as an administrator, all applications run with standard user privileges . UAC confirms elevated privileges before starting a non-Windows tool that requires administrative privileges . Windows features that require administrative privileges automatically receive elevated privileges without prompting the user .
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As described in 2, Windows 7 can reduce the number of UAC prompts when compared to Windows Vista . Instead of requiring multiple prompts for a file operation that performs multiple administrative tasks, all prompts are merged into a single prompt . Similarly, prompts from Internet Explorer are merged . When logged on as an administrator, you will no longer be prompted when Windows functions require administrator credentials . Additionally, there are now four levels of UAC notifications to choose from, as discussed later in the chapter . The sections that follow describe UAC behavior in more detail .
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Microsoft made many changes to the operating system so that standard users could perform almost any day-to-day task . Tasks that standard users can do without receiving a UAC prompt that requires administrative privileges in Windows XP include:
n n n n n n n n n n
Viewing the system clock and calendar Changing the time zone Connecting to wired or wireless networks Connecting to virtual private networks (VPNs) Changing display settings and the desktop background Changing their own passwords Installing critical Windows updates Installing device drivers that have been staged Scheduling tasks Adding printers and other devices that have the required drivers installed on the computer or that are allowed by an administrator in Group Policy Installing ActiveX Controls from sites approved by an administrator Playing or burning CDs and DVDs (configurable with Group Policy settings) Connecting to another computer with Remote Desktop Configuring battery power options on mobile computers Configuring accessibility settings Configuring and using synchronization with a mobile device Connecting and configuring a Bluetooth device Restoring backed-up files from the same user
n n n n n n n n
Additionally, disk defragmentation is scheduled to happen automatically in the background, so users do not need privileges to initiate a defragmentation manually . Some of the common tasks standard users cannot do include:
n n n n n n n
Installing and uninstalling applications Installing device drivers that have not been staged Installing noncritical Windows updates Changing Windows Firewall settings, including enabling exceptions Configuring Remote Desktop access Restoring system files from a backup Installing ActiveX controls from sites not approved by an administrator
CHapTER 24
Managing Client Protection
note
To install activeX controls in Internet Explorer, start Internet Explorer by right-
clicking the icon and then clicking Run as administrator. after installing the activeX control, close Internet Explorer and reopen it using standard privileges. after it is installed, the activeX control will be available to standard users.
The Power Users group still exists in Windows Vista and Windows 7 . However, Windows Vista and Windows 7 remove the elevated privileges . Therefore, you should make users members of the Users group and not use the Power Users group at all . To use the Power Users group on Windows 7, you must change the default permissions on system folders and the registry to grant Power Users group permissions equivalent to Windows XP . diReCt FRoM tHe SoURCe
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