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To make working within Windows PowerShell easier you can create aliases for cmdlets. One of the default aliases is dir, which is an alias for Get-ChildItem. To view currently assigned aliases you can run Get-Alias. To create an alias of nm for the New-Mailbox cmdlet, run the New-Alias nm New-Mailbox cmdlet. Another time-saving feature of Windows PowerShell is tab completion. You can start typing a cmdlet and press the Tab key and it will finish typing the cmdlet name for you. Tab completion is also available for cmdlet parameters.

Most administrators know that users should log on to their computers using accounts that are members of the Users group, but not the Administrators group . By limiting your user account s privileges, you also limit the privileges of any applications that you start including software installed without full consent . Therefore, if you can t add a startup application, neither can a malicious process that you accidentally start . With versions of Windows prior to Windows Vista, however, not being a member of the Administrators group could be very difficult, for a few reasons:

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Many applications would run only with administrative privileges . Running applications with elevated privileges required users to either right-click the icon and then click Run As or create a custom shortcut, which is inconvenient, requires training, and requires that the user has a local administrator account (largely defeating the purpose of limiting privileges) . Many common operating system tasks, such as changing the time zone or adding a printer, required administrative privileges .

Click Get Data. The dialog box shown in Figure 30-37 appears. The Databases tab of this dialog box lists data sources established by means of existing DSN files. You can select one of these and create your query, or you can create a new DSN file by selecting <New Data Source>. Queries already set up for your use are listed on the Queries tab, and available offline OLAP cube files are listed on the OLAP Cubes tab. You can select any of these items and use it to generate a PivotTable.

UAC is a feature of Windows Vista and Windows 7 that improves client security by making it much easier to use accounts without administrative privileges . At a high level, UAC offers the following benefits:

One of the features that puts the power in Windows PowerShell is the ability to pipeline information between cmdlets. In many other shells, such as those used by Linux, pipelining is done by passing strings from one command to another. Because Windows PowerShell is based on .NET, the information passed between cmdlets in a Windows PowerShell pipeline is objects with attributes that can be retrieved and modified. To pass the object collection from the output of one cmdlet into the next cmdlet, all you need to do is separate the cmdlets with the pipeline operator, the pipe character (|).

Most applications can now run without administrative privileges Applications created for Windows Vista or Windows 7 should be designed to not require administrator credentials . Additionally, UAC virtualizes commonly accessed file and registry locations to provide backward compatibility for applications created for earlier versions of Windows that still require administrator credentials . For example, if an application attempts to write to a protected portion of the registry that will affect the entire computer, UAC virtualization will redirect the write attempt to a nonprotected area of the user registry that will affect only that single application . Applications that require administrative privileges automatically prompt the user for administrator credentials For example, if a standard user attempts to open the Computer Management console, a User Account Control dialog box appears and prompts for administrator credentials, as shown in Figure 24-1 . If the current account has administrator credentials, the dialog box prompts to confirm the action before granting the process administrative privileges .

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