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The purpose of the ReaderWriterLock is to differentiate between the two classes of code that can use certain resources. By using the ReaderWriterLock, you can lock access to readers and writers separately. The ReaderWriterLock allows multiple readers to access the data at the same time, but only a single writer can get a lock on the data. All readers must release their locks before a writer can get a lock on the data. The ReaderWriterLock class s properties and methods are detailed in Table 7-9 and Table 7-10, respectively.

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Figure 7-17: Enable Remote Desktop When you enable Remote Desktop, Windows Firewall automatically updates rules to allow Remote Desktop connections to be made to the computer. If you reset Windows Firewall to its default settings, you need to re-enable the Remote Desktop firewall rules manually. You can also re-enable these rules by disabling and then re-enabling Remote Desktop. If you want to allow a standard user to connect remotely using Remote Desktop, you must add her account to the local Remote Desktop Users group. Only members of the Administrators and Remote Desktop Users local groups are able to make connections to a client running Windows 7 using Remote Desktop. When you click the Select Users button on the Remote tab of the System Properties dialog box, it opens the Remote Desktop Users dialog box, as shown in Figure 7-18. Any user you add using this dialog box is added automatically to the Remote Desktop Users group and this list displays all current members of that group, no matter what method was used to add the user accounts.

A digital signature is a value that can be appended to electronic data to prove that it was created by someone who possesses a specific private key. Digital signatures can be used to verify the integrity of data because it contains a hash and are typically used to prove that a particular person or organization created a file. Digital signatures also use asymmetric encryption, enabling you to verify that the holder of a particular private key generated the hash and created the signature. You can use both the DSACryptoServiceProvider and the RSACryptoServiceProvider classes in the .NET Framework to generate digital signatures. To generate a digital signature, create a digital signature class and call the SignData method. To verify a digital signature, create a digital signature class, retrieve the signature, and call the VerifyData method. To create a digital signature in an XML document, create an instance of the SignedXml class, and then call the ComputeSignature method. You can access the signature by calling the GetXML method.

In both cases, you create a RequestSecurityToken or a RequestSecurityTokenResponse object and use it as the parameter for the IssueSecurityContextTokenResponse method

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Figure 11-25: Configure offline settings Quick Check What are some of the differences between transparent caching and BranchCache when it comes to shared folders on remote networks Quick Check Answer Transparent caching does not require file servers running Windows Server 2008 R2. Transparent caching does not use a shared file cache. Windows 7 Professional supports transparent caching. Transparent caching can be used with computers that are not members of a domain.

Windows XP Professional supports two types of hard disk storage: basic disks and dynamic disks. Windows XP Home Edition supports only basic disks. You cannot use dynamic disks on portable computers, even if they are running Windows XP Professional.

When this chapter was written, a 64-bit version of Windows Server 2008 was not available to support Exchange Server 2007. Therefore, the practices in the chapter are written for the Windows Server 2003 backup utility (NTBackup). If your test computer's operating system is Windows Server 2008, the practices will differ from those described (although not radically). In this case, it is an instructive exercise to amend the practices to use the Windows Server 2008 backup utility.

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1. Which parameter should you specify for the SOAP payload to make the endpoint meaningful 2. Which parameter should never be enabled due to security concerns