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In Microsoft Windows, a primary domain controller (PDC) can be configured to enforce client systems to authenticate based on usernames and passwords stored in Open Directory databases. This PDC feature is available only in Mac OS X Server when it is running as an Open Directory master. A backup domain controller (BDC) should be used in this environment, because without a live PDC or BDC, clients will not be able to authenticate using their Open Directory based credentials. The BDC must be run on a replica. It also provides some form of high availability for the Windows domain structure. Although Windows systems can authenticate through the PDC, they cannot have Windowsbased policies enforced in this Open Directory based environment. However, you can push out home folders for roaming profiles and login scripts using LDAP attributes that are built into Workgroup Manager using the Windows tab. To enable an Open Directory server as a PDC, open Server Admin, and click Windows. Then click Settings, and choose Primary Domain Controller under the role (see Figure 13-18). Once the role has been set, enter a computer name and a workgroup name. Optionally, you can enable WINS registration on the Advanced tab. Legacy Windows systems need legacy authentication methods such as LAN Manager authentication. Therefore, you will need to determine whether your server will be supporting older clients such as Windows 95 or third-party appliances requiring this authentication type. Disable WINS registration if legacy clients will not be accessing the server.

Subtract the LED voltage from the power supply voltage and then divide the result by the LED current. For example, suppose that you have a 9V power supply, a 2V LED voltage drop, and you want 20mA (0.020A) of current. The calculated resistor value is 350 , but you would need to use a 330 resistor because that s the closest standard resistor value.

The Apple Active Directory service plug-in (AD-Plugin) is an extension that Apple added to its DirectoryService API. It can be configured using the Directory Access application. The AD-Plugin allows users of Mac OS X Client or Mac OS X Server to bind to Active Directory easily. It was developed by Apple to provide interconnectivity with Microsoft s Active Directory, and it supports Kerberos autoconfiguration for clients bound into Active Directory using DNS entries known as service (SRV) records. When you use the Active Directory plug-in to bind to Active Directory, you can set up Open Directory to connect to an Active Directory domain controller and have items accessible to Open Directory from Active Directory. Because you are connecting to an existing directory service, you will more than likely have all the policies for binding and passwords in place in your Active Directory environment.

This chapter covers two main persistence techniques The first is serialization, and how to integrate it into your application It s important to understand serialization properly and its ramifications Not doing so will result in overengineered objects that don t solve the problem efficiently The second persistence technique I cover is object-to-relational (O/R) mapping O/R mapping is very useful because there exists an object-to-relational impedance mismatch1 An additional book that complements the materials presented here is Scott Ambler s Agile Database Techniques (Indianapolis: Wiley Publishing, 2003)..

Note Much of the Active Directory integration configuration is available in the GUI for 10.5 and 10.4 and

V VDrop [ ] l 9 2 = 350 [ ] 0.02

Serialization is the process of converting the state of an object in memory into a state of another medium that is a complete representation of the object. Other media include hard disks and networks. Serialization is implemented using the Serializer pattern.2 In a general sense, the Serializer pattern is implemented using two pieces: a serializable class and a serialization reader or writer class. The serializable class dictates what data to serialize. The serialization reader or writer class deals with transferring the contents of the serializable class to and from the other medium. The idea is that by separating what s transferred and how it s transferred, the possibility exists of dynamically changing the medium without changing the implementation of the serializable class. In UML terms, the Serializable pattern is similar to what you see in Figure 8-1.