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12. Click Apply to perform the renaming. It s that easy. Imagine how much time you would save using the rename feature if you had 10 files with hundreds of lines of code. Not only would you be sure to find every occurrence, but the code would be a lot easier to read. 13. The third way to rename a symbol, and in this case only for project elements, is to do it directly in Solution Explorer. Even though earlier we changed the Form1 variable into something more meaningful, the filename Form1 hasn t changed because it s not in the source code; it s in Solution Explorer and contained in the project, so it s still Form1.cs. For consistency, right-click the filename Form1.cs in Solution Explorer, select Rename, and change the filename to TestProjectFormOtherName.cs. Two things will happen: first, you ll see that the filename and all dependent filenames are automatically changed to the new name; second, you ll see that all project references to TestProjectForm are now changed to TestProjectFormOtherName. You can verify this renaming change by pressing Ctrl+F and performing a search on the old name (Form1.cs).

Windows XP SP2 adds some important improvements to the way Outlook Express handles e-mail. By default, the SP2 version of Outlook Express blocks access to potentially unsafe attachments while still enabling safe attachments. Additionally, e-mail that has pictures and images that could be Web beacons are blocked when viewing HTML e-mail. Outlook Express also gives you the option to view and preview all e-mail as plain text, eliminating the security concerns related to HTML e-mail. Plain text does prevent you from seeing fonts and font effects, along with the pictures in the e-mail, but it does add an additional layer of security.

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Windows XP SP2 adds several new features to Internet Explorer to improve its security. These include a new pop-up blocker; better screening of and information about potentially harmful downloads; a new add-on manager that makes it easier to see and control what is installed into Internet Explorer; limitations on the ability of Web sites to change the window size and controls of Internet Explorer; and tighter security on the Local Machine zone. The new gold bar a gold-colored information bar that appears at the top of the browser window when a pop-up or potentially harmful download is blocked provides improved information on the item being blocked, along with the ability to override the block. When a pop-up window is blocked, you can allow pop-ups temporarily or permanently for the site.

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Your VPN connection is blocked by a firewall. For the most part, utilizing VPN connectivity when one endpoint is behind a firewall is not an issue. Most firewalls allow liberal privileges when it comes to outgoing connections. Incoming connections are another story. For a VPN server that sits behind a firewall to accept incoming connections, the firewall needs to be configured to allow PPTP and/or L2TP/IPSec traffic. A number of different techniques for setting up a VPN server allow you to connect to a network that is placed behind a firewall device that you manage. One technique is to

When you are downloading files from the Internet, SP2 gives you additional information about the specific file and the certificate that is attached to it. Content that might not be what it claims to be is flagged, and you also have the option to never download content from a specific publisher.

The authentication process has two fundamental parts credentials and validation. Credentials Credentials assert the identity of the applicant. A validating agent either confirms or denies the validity of the credentials, determining the level of trust granted the applicant. At an international border, for example, a passport issued by a recognized national government would be a traveler s credentials, and a crossing guard representing the government of the country/region one attempts to enter would be the validating agent. Typically, a passport is considered a strong guarantee of a bearer s identity. On the other hand, a business card is another kind of a credential or proof of identity that is validated with much less rigor. In Windows 2000 and Windows XP Professional, a user s credentials can be supplied by a password, a Kerberos ticket, or a smart card if the computer is equipped to handle a smart card. For more information about smart cards, see Smart Cards later in this chapter. Validation Validation in Windows is performed by a protected subsystem called the Local Security Authority (LSA), which maintains information about all aspects of local operating system security. In addition to providing interactive user authentication services, the LSA does the following: