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Hardware DEP works by marking all pages in memory as non-executable unless the page explicitly contains executable code. This process helps prevent malicious attacks that try to insert and run executable code into memory. To use hardware DEP, a computer must have a compatible processor that allows Windows to mark memory pages as non-executable. Both Intel and AMD provide hardware DEP compatible processors. Software DEP is a set of security checks that can run on any processor capable of running Windows XP. However, the security provided by software DEP is limited compared to that provided by hardware DEP. You can configure DEP by using the Data Execution Prevention tab of the Performance Options dialog box. By default, DEP is enabled for only essential Windows programs and services. However, you can turn DEP on for all programs and services, and then select specific programs and services for which you do not want DEP enabled.

Using a temporary Session It should be clear why you require a Session inside the AuditLogInterceptor. The interceptor has to create and persist AuditLogRecord objects, so a first attempt for the onSave() method could be the following routine:

Configure the automatic updates client. Configure Group Policy to support automatic updates. Schedule updates and restarts.

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You can enhance system performance in several ways. First, if your computer has multiple hard disk controllers, you can create a paging file on a disk on each controller. Distributing information across multiple paging files improves performance because Windows can read and write from disks on different controllers simultaneously. When attempting to write to the paging file, VMM tries to write the page data to the paging file on the controller that is the least busy. Second, you can enhance performance by moving the paging file off the drive that contains the Windows XP Professional %systemroot% folder (by default, the Windows folder), which avoids competition between the various reading and writing requests. If you place a paging file on the Windows XP Professional system partition to facilitate the recovery feature, which is discussed in the section entitled How to Configure Startup and Recovery Settings later in this lesson, you can still increase performance by creating multiple paging files. Because the VMM alternates write operations between paging files, the paging file on the boot partition is accessed less frequently. Third, you can enhance system performance by setting the initial size of the paging file to the value displayed in the Virtual Memory dialog box s Maximum Size box, which eliminates the time required to enlarge the file from the initial size to the maximum size.

if (entity instanceof Auditable) { AuditLogRecord logRecord = new AuditLogRecord(...); // set the log information session.save(logRecord); }

Each user account in Windows XP has an associated user profile that stores userspecific configuration settings, such as a customized desktop or personalized application settings. Understanding how user profiles function and how to control them lets you effectively manage the user s desktop environment. Windows XP supports three types of user profiles:

Local A local user profile is available only on the system on which it was created. A unique local user profile is created and stored on each computer that a user logs on to. Roaming Roaming profiles, which are stored in a shared folder on a network server, are accessible from any location in the network. Mandatory Mandatory user profiles are roaming user profiles that users cannot make permanent changes to. Mandatory profiles are used to enforce configuration settings.

This seems straightforward: Create a new AuditLogRecord instance and save it, using the currently running Session. This doesn t work. It s illegal to invoke the original Hibernate Session from an Interceptor callback. The Session is in a fragile state during interceptor calls. You can t save() a new object during the saving of other objects! A nice trick that avoids this issue is opening a new Session only for the purpose of saving a single AuditLogRecord object. You reuse the JDBC connection from the original Session. This temporary Session handling is encapsulated in the AuditLog class, shown in listing 12.2.

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public class AuditLog { public static void logEvent( String message, Auditable entity, Long userId, Connection connection) { Session tempSession = getSessionFactory().openSession(connection); try { AuditLogRecord record = new AuditLogRecord(message, entity.getId(), entity.getClass(), userId ); tempSession.save(record); tempSession.flush(); } finally { tempSession.close();

Windows stores local user profiles in the Documents And Settings folder hierarchy on the %systemroot% drive. When a user logs on to a Windows XP system for the first time, Windows creates a folder in Documents And Settings that matches the user s user name. Within each user profile, several files and folders contain configuration information and data. These files and folders include the following: