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The Microsoft Management Console (MMC) allows you to add multiple snap-ins that can connect to different remote computers. If you routinely monitor shared folders and users on several different remote computers, you can create a custom console that lets you switch between those computers easily. To create a custom console for monitoring multiple remote computers, follow these steps: 1. Click Start, and then click Run. 2. In the Run dialog box, type mmc, and then click OK. Windows XP displays an empty MMC console named Console 1. 3. Click File, and then click Add/Remove Snap-In. 4. In the Add/Remove Snap-In dialog box, click Add. 5. In the Add Standalone Snap-In dialog box, in the Available Standalone SnapIns list, click Shared Folders, and then click Add. 6. In the Shared Folders dialog box, click Another Computer, and then type the name of the remote computer (or click Browse to locate the computer on the network). 7. Repeat Steps 5 and 6 for each computer you want to add to the console.

1

A @Stateless annotation turns this plain Java class into a stateless session bean. At runtime, a pool of instances is prepared, and each client that requests a session bean gets an instance from the pool to execute a method. All methods that are called on this session bean are wrapped in a system transaction, which enlists all transactional resources that may be used during that procedure. This is also the default if you don t annotate the bean. A session bean needs an interface. Usually you implement this interface directly. The EditItem interface has two methods. When the runtime container hands out a session bean instance from the pool, it injects an EntityManager with a (fresh) persistence context scoped to the transaction. If a client calls findById(), a system transaction starts. The EntityManager operation executes an SQL query in that transaction; the persistence context is flushed and closed when the transaction commits (when the method returns). The returned Item entity instance is in detached state. If a client calls save(), a system transaction starts. The given detached instance is merged into a (new) persistence context. Any changes made on the detached Item instance are flushed and committed to the database. A new handle to the now up-to-date Item instance is returned. This new Item instance is again in detached state when the method returns, and the persistence context is closed.

Enhancements to Windows Firewall enable the firewall for each connection by default, allow the inspection of traffic from the moment the connection becomes active, and let you make global configuration settings for all connections. Enhancements to Internet Explorer include a new Information bar that consolidates many user prompts, a pop-up blocker, and better add-on management.

A computer running Windows XP Professional can be a member of two types of networks: a workgroup or a domain. You can designate a computer running Windows Server 2003 as a domain controller. If all computers on the network are running Windows XP Professional, the only type of network available is a workgroup. Features of workgroups and domains include:

You can call the session bean shown in listing 17.4 a data access object (DAO). It can also be a session facade. The application isn t complex enough to make a clear distinction; if more nondata access methods were added to its interface, the session bean would represent part of the business layer interface with a traditional (mostly procedural) session facade. A piece is still missing from the puzzle: The JSF input widgets and buttons have value and action bindings to a backing bean. Is the backing bean the same as the session bean, or do you have to write another class Connecting the layers with a backing bean Without Seam, you have to write a backing bean that connects your JSF widget state and actions to the transactional stateless session bean. This backing bean has the getter and setter methods that are referenced with expressions in the pages. It can also talk to the session bean and execute transactional operations. The code for the backing bean is shown in listing 17.5.