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If you re connected to the Internet, the Player can download information about the CD you re currently playing, including the album cover, track names, a bio of the artist or group, and a review of the album; details about artists and albums are provided by All Media Guide (AMG) (http://www.allmediaguide.com). To see what information the Player finds about a particular CD, choose View, Now Playing Options, Show Media Information. Click the links at the top of the Info Center to see information that was automatically detected. (If a visualization is currently playing, you may need to select one of the options on the View, Info Center View menu.) For a more concise view, and to update your Media Library, click the Find Album Info link at the bottom of any page. (To learn more about how Windows Media Player stores this information and how you can work with it, see Managing Your Media Library, page 756.) Album art, once retrieved from the Internet, is cached on your computer. Thereafter, even if you re no longer online, you can display the album art in the visualization area of Now Playing. To do this, choose View, Visualizations, Album Art. Figure 19-12 shows Now Playing with album art in the visualization area.

var query1 = from book in SampleData.Books group book by book.Publisher, book.Subject; var query2 = from book in SampleData.Books group book by book.Publisher group book by book.Subject;

If a server is configured with Securews.inf, the following constraints apply:

Figure 19-12. The Player can show album art that it retrieved from the Internet in the visualization area, even after you ve logged off.

A client with a local account on that server cannot connect to it from a client com puter running only LAN Manager using that local account. If the server is running Windows 2000, a client with a local account on the server configured to use NTLM version 2 authentication will not be able to connect unless the clocks on the two machines are within 30 minutes of each other. If the server is running Windows XP, a client with a local account on the server configured to use NTLM version 2 authentication will not be able to connect unless the clocks on the two machines are within 20 hours of each other.

The Player doesn t show media information. If displaying Media Information in the Player doesn t show such information as track titles in the Media Information window or in the playlist, click the Refresh button at the top of the Info Center pane. If that doesn t solve the problem, try ejecting the CD and reloading it. Also, remember that you must be connected to the Internet to retrieve information for a CD.

Securedc.inf If a domain controller is configured with Securedc.inf, a user with an account in the domain cannot connect to any member server from a client computer running only LAN Manager using that domain account. The secure templates also provide further restrictions for anonymous users by prevent ing anonymous users (such as users from untrusted domains) from enumerating account names and shares and performing SID-to-name or name-to-SID translations. Finally, the secure templates enable server-side SMB packet signing, which is disabled by default for workstations and servers. Because client-side SMB packet signing is enabled by default, SMB packet signing is always negotiated when workstations and servers are operating at the secure level.

Like all Internet-enabled applications, Windows Media Player creates a two-way channel between your computer and an ocean of content. Clicking on a link to a media file can take you to a trusted site or a viper s den. Known security holes in previous versions of Windows Media Player created the potential for an attacker to install a virus or Trojan horse program by exploiting the Player s Web-browsing capabilities. In addition, because the Player is capable of using the Internet to download information about the content you watch or listen to, it raises worrisome privacy issues. Some privacy advocates, for instance, argue that the same connection that downloads information about a music track or DVD is also, at least in theory, capable of sending information about a user s viewing habits to Web sites that have no legitimate need for that information.

This doesn t mean that it s impossible to perform grouping by multiple criteria in a query expression. The trick is to use an anonymous type to specify the members on which to perform the grouping. We know this may sound difficult and several options are possible, so we ll break it down into small examples. Let s consider that you want to group by publisher and subject. This would produce the following results for our sample data:

Default Security Template (Setup security.inf)

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The default security template is a computer-specific template that represents the default security settings applied during the installation of the operating system,

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