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Microsoft Windows XP makes it easy to stay connected while minimizing your exposure to attacks. Naturally, you can connect to traditional wired networks. You can also connect to wireless networks at your home or office, or at wireless hotspots. If you are away from the office, you can connect to any Internet connection and use Windows XP to create a virtual private network (VPN) connection to access resources on your internal network. If an Internet connection is not available, but you can access a telephone line, you can use dial-up networking to connect to your office network. It is risky to connect to any network, especially the Internet. Windows XP helps protect you from network attacks by using Internet Connection Firewall (ICF) and, when Service Pack 2 is installed, Windows Firewall. Both ICF and Windows Firewall are capable of providing similar levels of protection by blocking all incoming connections that have not specifically been allowed. Windows Firewall is enabled by default, however, and is easier to configure. In Active Directory environments, domain administrators can configure Windows Firewall by using Group Policy settings. For troubleshooting problems with remote computers and helping users across a network, Windows XP provides Remote Desktop and Remote Assistance, both of which display a remote computer s desktop on your own computer. Additionally, Windows XP can act as either a Web server or a Web client, thanks to Internet Information Services (IIS) and Microsoft Internet Explorer. To complete this objective, you must understand how to install, configure, and troubleshoot all these technologies.

select * from USERS u left outer join BILLING_DETAILS bd on bd.USER_ID = u.USER_ID where u.USER_ID = 123

For more information about supporting handheld devices running Windows Mobile software, visit the Windows Mobile page of the Microsoft Web site at http:// www.microsoft.com/windowsmobile/.

In this practice, you use Device Manager to disable and re-enable a hardware device. Complete the following steps. 1. From the Start menu, click Control Panel. 2. In the Control Panel window, click Performance And Maintenance. 3. In the Performance And Maintenance window, click System. 4. In the System Properties dialog box, on the Hardware tab, click the Device Manager button.

As you can see, to efficiently use joins you need to know what portion of the object network you plan to access when you retrieve the initial User this is before you start navigating the object network! On the other hand, any object persistence solution provides functionality for fetching the data of associated objects only when the object is first accessed. However, this piecemeal style of data access is fundamentally inefficient in the context of a relational database, because it requires executing one statement for each node or collection of the object network that is accessed. This is the dreaded n+1 selects problem. This mismatch in the way you access objects in Java and in a relational database is perhaps the single most common source of performance problems in Java applications. There is a natural tension between too many selects and too big

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5. In the Device manager window, expand the Ports (COM & LPT) category, rightclick the parallel port almost always named Printer Port (LPT1) and click Properties. 6. In the Printer Port (LPT1) Properties dialog box, on the General tab, in the Device Usage drop-down list, select Do Not Use This Device (Disable). Click OK. 7. In the Device Manager window, note that the icon for Printer Port (LPT1) has a red x on it, indicating that the device is disabled. Right-click the Printer Port (LPT1) and click Properties. 8. In the Printer Port (LPT1) Properties dialog box, on the General tab, in the Device Usage drop-down list, select Use This Device (Enable). Click OK. 9. Close all open windows.

selects, which retrieve unnecessary information into memory. Yet, although we ve been blessed with innumerable books and magazine articles advising us to use StringBuffer for string concatenation, it seems impossible to find any advice about strategies for avoiding the n+1 selects problem. Fortunately, Hibernate provides sophisticated features for efficiently and transparently fetching networks of objects from the database to the application accessing them. We discuss these features in chapters 13, 14, and 15.