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After you delete an account, of course, that user can no longer log on. Deleting an account also has other effects you should be aware of. You cannot restore access to resources that currently list the user in their access control lists simply by re-creating the account. This includes files to which the user has permission and the user s encrypted files, personal certificates, and stored passwords for Web sites and network resources. That s because those permissions are linked to the user s original SID not the user name. Even if you create a new account with the same name, password, and so on, it will have a new SID, which will not gain access to anything that was restricted to the original user account. You might encounter another predicament if you delete an account. If you use a tool other than User Accounts to delete the account, the user s original profile remains in the Documents And Settings folder. If you later create a new account with the same name, Windows creates a new profile folder, but because a folder already exists with that user s name (for example, C:\Documents And Settings\Josie), it appends the computer name to the user name to create a convoluted folder name (for example, C:\Documents And Settings\Josie.SEQUOIA). The extra folder not only consumes disk space, but leads to confusion about which is the correct profile folder. (In general, the one with the longest name is the most recent. But you can be certain only by examining files in the profile folder.) To avoid this problem, use User Accounts to delete accounts because it properly deletes the old profile along with the account.

To go further, you may use an anonymous type to specify the shape of the resulting elements. In the following query, we specify that we want to retrieve the title and publisher name for each book in grouping by subject:

5. Which of the following trust types are created implicitly Choose all that apply. a. Tree-root b. Parent-child c. Shortcut d. Realm e. External f. Forest

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The correct answers are a and b. Shortcut, realm, external, and forest trusts must all be cre ated manually (explicitly).

Delete an unused profile when you delete an account If you delete an account with a tool other than User Accounts, the account s profile continues to occupy space in the Documents And Settings folder and in the registry. You don t want to delete the files or registry entries directly because a simple mistake could affect other accounts. Instead, right-click My Computer and choose Properties. Click the Advanced tab and then click Settings under User Profiles. Select the account named Account Unknown (the deleted account), and click Delete.

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var query = from book in SampleData.Books group new { book.Title, book.Publisher.Name } by book.Subject into grouping select new {Subject=grouping.Key.Name, Books=grouping };

1. Right now, Research and Marketing are sharing data by burning CD-ROMs and DVD-ROMs. Under the current structure, how could Research and Marketing share information over the network

If your computer is not part of a domain, Windows XP offers two different methods for users to log on:

There are two main options: 1) The departments could share resources to Everyone and allow unauthenticated access to their resources. This could pose a security risk as they d be allowing anyone access to their data, instead of just users in the Research or Marketing departments. 2) Research and Marketing could create trust relationships between their separate forests and share information to specific users in a more secure way.

The Welcome screen, shown in Figure 7-7, offers an easy way for users to log on. Users simply click their name and, if required, type their password. For more information, see Using the Welcome Screen, page 220.

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In this query, we use only the subject as the key for the grouping for the sake of simplicity, but you could use an anonymous type as in the previous query if you wish.

Figure 7-7. The Welcome screen provides the simplest logon system for computers shared by only a handful of users.

2. Laura asks you, What if we decided that ITS should handle the entire institute s network administration If we were building the entire administrative structure right now using Windows Server 2003 and Active Directory, how would it be dif ferent than what we have now

Managing User Accounts, Passwords, and Logons Note Don t be misled by the fact that the word Welcome appears nowhere on the Welcome screen, yet the classic logon screen shows a Welcome To Windows dialog box. In dialog boxes and in help, references to the Welcome screen refer to the logon screen shown in Figure 7-7.