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Tables of Contents for Professional Jini
Chapter/Section Title
Page #
Page Count
Introduction
1
1
Welcome
1
1
Who Is This Book For?
1
1
What's Covered In This Book?
1
1
What Do You Need To Use this Book?
2
1
Hardware
2
1
Software
2
1
Source Code Download
2
1
On-Line Discussion
3
1
Conventions
3
1
A Note on Spelling
3
1
Tell Us What You Think
4
3
Section 1: Introduction, Background, and Motivation
7
124
Java and the High-Bandwidth Internet Revolution
9
14
Product of the Bandwidth Revolution
9
3
Java: Providing the Networking Substrate
12
1
Jini: Towards Truly Distributed Systems
12
3
The Evolution of Java
15
1
Applying Jini to Networked `Instant On' Plug-and-Work Device Support
15
2
What is Covered in this Book?
17
6
Sections in the Book
18
1
Chapters in the Book
18
5
From Sockets to Remote Method Invocation - Basic Java Networking
23
26
Epitome of Java Networking: Sockets
23
14
Endpoint-to-Endpoint Communications
24
1
The JDK Socket Classes
25
1
Creating a Client Socket
25
1
Reading and Writing to the Client Socket
26
1
Creating a Server Socket
26
1
A Simple Socket Application
27
1
Server Side Implementation
27
1
Client Side Implementation
28
1
Testing the Socket Program
29
1
A Busier Server
30
1
Testing out the Busier Server
30
1
Servicing Multiple Clients Concurrently
31
2
Testing the Multithread Service
33
1
System Failure under Production Torture Test
33
1
Generic Work Service: Making Our Servers More Flexible
34
1
The Generic Work Interface
34
1
The Generic Service Itself
34
1
The WorkLoad Class
35
1
Taking a Logical Leap of Faith
36
1
RMI: Higher Level Network Access for Complex Applications
37
7
Giving Networking an Object Oriented View
38
1
Remote Method Invocation is much more than Remote Procedure Calls
38
1
Object to Object Across Networks - Implementing RMI
39
1
The Remote Interface
39
1
Throwing RemoteException
39
1
Remote Interface Implementation - Server-Side Object
40
1
Working With Remote Interfaces - Client Implementation
41
1
RMIC - Generating Stubs
42
1
Testing the Basic RMI Application
43
1
The RMI Class Tree
44
1
About UnicastRemoteObject
45
1
Networking in Java is Naturally Simple
45
4
Advanced RMI
49
40
Advanced RMI Features
49
11
Serving up Stubs Remotely
49
2
Passing Parameters in RMI
51
1
Understanding Dynamic Class Loading
52
1
Object Marshalling
53
1
Codebase URL Annotation
53
2
Delivery of Dynamically Loaded Classes
55
5
Security Managers and Policy Files
60
1
Bootstrapping using RMIRegistry
60
1
RMI Over and Through the Internet
60
17
RMI over Firewalls
61
1
Setting Up a Firewall Test Network
62
5
Securely Encrypted Datastreams with RMI Over SSL
67
1
The Java Secure Sockets Extension 1.0
68
1
About SSL
68
3
Creating Your Own Set of Keys Using Keytool
71
2
Installing JSSE 1.0
73
1
RMI with Alternate Socket Factory: RMI over SSL
74
3
Achieving RMI Immortality - Activatable Objects
77
9
Activatable Objects give the System Hope for Fault Tolerance
78
1
RMID: the Activation Subsystem
78
1
Robust Persistence: Can it be Done?
79
1
A Word on Activation Groups
79
1
The Road to Immortality
80
1
Implementing an Activatable Object
80
1
Creating the Setup Program
81
1
Who's got Whose Codebase?
82
1
Client Transparency
82
1
Testing our Activatable Object System
82
1
Implementing Fault Toleration
83
1
The Setup Program
84
1
The Happy but Ignorant Client
85
1
Testing the Fragile System
86
1
Java Networking Beyond RMI and Sockets
86
3
CORBA and RMI-IIOP in a Distributed World
89
42
CORBA
90
6
Inside CORBA
91
1
The Object Request Broker (ORB)
91
2
The Stubs and Skeletons
93
1
Object Adapters
93
1
IDL Compiler and Language Specific Bindings
94
2
Skeleton Implementation of Interface Methods and Delegation
96
3
Server Implementation via Direct Mapped Interface
96
1
Server Implementation Using a TIE
97
1
Dynamic Invocation and Interface Repository
98
1
Sun's JDK ORB: CORBA, Java Style
99
8
Generating Stub and Skeleton From IDL
100
2
Implementing the Server and Remote Object
102
2
Creating CORBA Clients Based on IDL Generated Stubs
104
3
Working with Another Vendor's ORB: Visigenic
107
8
Generating Stubs and Skeleton from the IDL
108
2
Writing a CORBA server for the Visigenic ORB
110
1
Creating CORBA Clients Using Visigenic VisiBroker for Java
111
1
Testing Visigenic Intra-ORB Operations
112
1
Testing Visigenic and JDK Inter-ORB Operations
113
2
Extreme Inter-ORB Interoperability: ORBit on Red Hat Linux 6.2 using GNU C
115
6
Getting the ORBit ORB
116
1
Generating Stubs and Skeletons Using the orbit-idl Compiler
116
1
Creating a C-Based CORBA Client Using Generated Stub
117
4
JDK 1.3's No-Work CORBA Support: RMI-IIOP
121
2
New RMIC Options Enable RMI-IIOP
121
1
Enable CORBA Client Access to RMI Objects
122
1
RMI-IIOP Considerations
122
1
New CORBA 2.3 Object-by-Value extension
123
1
Trying out RMI-IIOP
123
5
Coding an RMI-IIOP Server
124
1
Compiling and Generating RMI-IIOP Stubs and TIEs
125
1
Creating the IIOP Client
125
1
Testing RMI-IIOP Operation
126
2
What Jini Brings to RMI and CORBA
128
3
Section 2: One Technology
131
401
Overview
133
12
Seeking Solutions to Design Problems
138
1
Locating Services
139
1
Interacting with Services
140
1
New Services Joining the Network
141
1
Dealing with Machine Failures
141
1
Dealing with Partial Failures
142
1
Handling Synchronization Issues
142
1
Upgrade and Enhancement of Service Implementations
143
1
Overview of Upcoming Chapters
143
2
Discovery and Join Protocols
145
38
Jini Groups and Network Partitioning
146
1
Discovery Protocols
147
3
Successful Discovery
148
1
About Service IDs
149
1
The Unicast Discovery Protocol in detail
149
1
IP Multicast
150
15
Working with IP Multicast
151
1
A Multicast To UDP Tunneling Bridge
152
10
The Multicast Request Protocol in detail
162
2
The Multicast Announcement Protocol in detail
164
1
Setting Up a Jini Network
165
8
Setting UP Jini on Win32 Based Systems
166
6
Setting Up Jini on UNIX Systems: Redhat Linux 6.2
172
1
Analysis of the Discovery Protocols: On-The-Wire
173
6
Testing the jintool Multicast Packet Decoder
177
2
The Join Protocol
179
2
Summary
181
2
Jini Lookup Service and Entries
183
50
The Roles of a Jini Lookup Service
184
2
Basic Lookup Operation
185
1
Other Responsibilities of a Lookup Service
186
6
Lookup Service as Bootstrapping Assistant
187
1
Lookup Service's Database Management
188
1
Lookup Service's Maintenance of the Long-lived, Self-healing Network
189
1
Lookup Service as a Social Security Designer
189
2
Lookup Service Enabling Inter-Federations Communications
191
1
Anatomy of a Jini Lookup Service
192
4
External Interactions
192
1
Major Functional Blocks of the Jini Lookup Service
193
3
Attributes of a Proxy and Entries
196
8
Jini Entry
196
1
Storing an Entry
197
1
Matching an Entry
197
1
Fetching an Entry
197
1
Service References as Fields
198
1
Entry Serialization Semantics
198
1
The Service Item
198
1
Attaching Attributes
198
4
Template Based Matching
202
1
Lookup Entries and JavaBeans
202
2
Working with a Lookup Service
204
24
Protocol Handling
204
1
Coding a Utility to Discover Lookup Services
205
5
Testing the DiscoverRegistrars utility
210
2
Proxy Registrations by Services
212
5
Lookup by Clients
217
11
Lookup Service Strategies
228
1
Naturally Dynamic Topology
228
1
So How Does Jini's Lookup Service Compare?
229
4
Making Connections
231
2
Jini Distributed Events
233
32
Remote Events in Jini
234
28
Event Concepts in Detail
235
1
Asynchronous Notification
235
1
Java Event Notification Mechanism
236
1
Extending the Model Across the Network
236
2
The Problems Inherent to Remote Events
238
1
Selection of Event ID and Sequence Number
239
2
Third-Party Event Handling
241
1
Event Routing Through Pipelines
242
1
Implementing an Event Consumer
243
1
The Event Producer Role of a Lookup Service
244
1
Event Consumer Jini Client Coding
245
4
Creating RMI Stubs
249
1
Testing the Event Client
249
2
Implementing an Event Producer
251
5
Tracking Event Registrations
256
1
Firing Events
256
2
Making RMI Stubs
258
1
Modifying the EvtClient to use EvtService
258
2
Testing Our Own Remote Event Producer and Consumer
260
2
Summary
262
3
Distributed Leasing in Jini
265
30
Applied Distributed Leasing
265
5
Leases and Distributed Allocation of Finite Resources
265
1
When Not to Lease
266
1
Negotiating Lease Duration
266
1
Lease Renewal
267
1
The Lease Interface
267
1
Clockskew - Relative and Absolute Durations
268
1
Lease Maintenance Optimization: LeaseMap
269
1
Granting Leases - Jini Landlords
270
5
What To Take a Lease Out On?
270
1
Jini Library Support for Lease Grantors
271
1
The Landlord Remote Interface
272
1
Inside the Landlord
272
2
Leased Resources
274
1
Decorative Cookies
274
1
Lease Expiry Mechanism
275
1
A Highly Usable Library Implementation
275
1
Implementing Your Own Lease Grantor
275
17
Lease Negotiation API
276
1
Coding the Service
276
6
Coding the Landlord Support Logic
282
4
Modifying a Client to Test the Landlord
286
1
Testing the Landlord Implementation
287
2
Testing the Lease Expiry Mechanism
289
1
Implementing Reliable Lease Renewal
290
2
Summary
292
3
Distributed Transactions
295
30
A Page from Classic Transaction Theory: ACID Properties
296
2
Transactions: Against Partial Failure
297
1
Jini Transactions
298
12
The Two-Phase Commit Protocol
298
1
Jini's Transaction Provisions
299
1
How Jini Clients Use Transactions
300
1
Implementing a Client that uses Transactions
301
1
Creating a non-Transactional Base Client
301
3
Changes to Make Client Transactional
304
3
Testing the Two Clients
307
3
Implementation of a Transaction Participant
310
7
The HitmanService Implementation
311
1
Persisting States to Permanent Storage
311
1
Persisting Service IDs Separately
312
1
Persisting Remote References with Associated Codebase
312
3
Crash Recovery for 2PC Support
315
1
Execution Ordering within Constructor
316
1
JoinManager and Persistent Service IDs
317
1
Joining a Transaction On Demand
317
1
Handling Shutdown Requests
318
1
TransactionParticipant Interface Implementation
318
5
Summary
323
2
Basic Helper Utilities
325
50
Jini Library Development Support
326
3
The Architecture of Helper Utilities and Services
326
3
Approach to Learning and Applying Helper Utilities and Services
329
1
Basic Protocol Utilities in Depth
329
23
The Discovery Management Interfaces
329
1
Managed Sets
329
1
Management of Discovered Registrars
330
2
Management of Groups Used During Discovery
332
1
Management of Unicast Discovery Information
333
2
Design Rationale
335
1
How Do We Use LookupLocator?
335
3
The LookupDiscovery Utility
338
1
The Design of the LookupDiscovery Utility
338
1
What Will LookupDiscovery Do?
339
1
Using the LookupDiscovery Utility
340
11
What LookupDiscovery Will Not Do For Us
351
1
Mid-Level Protocol Manager Utilities In-Depth
352
23
LookupLocatorDiscovery Utility
352
1
Design for LookupLocator Discovery
352
2
Using the LookupLocatorDiscovery Class
354
10
What LookupLocatorDiscovery Will Not Do For Us
364
1
LookupDiscoveryManager Utility
365
1
Inside the LookupDiscoveryManager Utility
365
1
Using the LookupDiscoveryManager Utility
366
6
What the LookupDiscovery Manager Won't Do For Us
372
1
Moving Onto Higher Level Manager Utilities
372
3
High-Level Helper Utilities and Helper Services
375
54
The LeaseRenewalManager High-Level Manager Utility
376
1
Design Rationale
376
1
Inside the LeaseRenewalManager Utility
376
3
What LeaseRenewalManager Will Not Do For Us
379
1
The JoinManager High Level Manager Utility
380
1
Design Rationale
380
1
What Will the JoinManager Helper Utility Do?
380
3
Using the JoinManager Utility
383
11
What JoinManager Will Not Do For Us
394
1
ServiceDiscoveryManager Class
394
1
Design Rationale
394
1
What Does the ServiceDiscoveryManager Do?
394
4
Using the ServiceDiscoveryManager Utility
398
4
What ServiceDiscoveryManager Will Not Do For Us
402
1
Helper Services - Making the Impossible Possible
402
27
Fiddler: The LookupDiscoveryService
403
1
Design Rationale
403
1
What Will LookupDiscoveryService Do?
404
2
Using the Fiddler Service
406
2
Norm: The LeaseRenewalService
408
1
Design Rationale
408
1
What Will Norm Do For Us?
408
1
Using Norm, the LeaseRenewalService Service
409
2
Mercury - The EventMailbox Service
411
1
Design Rationale
412
1
What Will Mercury Do?
412
1
Using the Mercury EventMailbox Service
413
1
Applying Fiddler, Norm, and Mercury - The Instant Jini Service Creation Environment
414
10
Summary
424
5
Implementing Jini Services
429
50
Patterns in Jini Service Implementation
430
3
One Consistent Client Interface for All Architectures
430
3
The Local Proxy Pattern
433
22
The RMI Based Proxy Pattern
436
3
The Smart Proxy Pattern
439
4
A Remote Service that Does Not Use RMI
443
7
From CORBA to Jini
450
5
The Payload Launcher View
455
21
Handling Non-Java Jini Services
456
1
Exposing JVM-less Devices as Jini Services
457
1
The Surrogate - Providing a Jini Soul for Java-Free Devices
458
4
ServiceUI - Providing a User Interface for a Jini Service
462
5
Putting ServiceUI to Work
467
9
Extending the ServiceUI Paradigm to the Distributed Environment
476
1
Summary
476
3
JavaSpaces as a Jini Service
479
53
Jini Services: Facilitatating Distributed Architectures
480
1
The UNIX Pipe
480
1
The Remarkably Unremarkably JavaSpace Interface
481
1
The Basic JavaSpaces Premise
481
1
The Simple JavaSpaces Operations
482
3
The Write Operation
482
1
The Read Operation
482
1
The Take Operation
483
1
Blocking versus Non-Blocking Operations
483
1
The Notify Method
484
1
Other Helper Methods
484
1
JavaSpaces and Transactions
485
1
Aside: Resounding JavaSpaces Enthusiasm
485
1
Visibility of State Changes and Transactions
486
2
Transactions and Distributed Events
487
1
Hands On JavaSpaces
488
1
Transient versus Persistent JavaSpace Reference Implementations
488
1
Starting the Transient outrigger
488
1
A Framework for JavaSpace Programming
489
18
Writing to a JavaSpace
492
3
Working with JavaSpace's Browser Utility
495
2
Reading Entries from a JavaSpace
497
2
Taking Entries from JavaSpaces
499
1
Working with Transactions
500
5
Using takelfExists() Variation to Determine Transaction Visibility
505
2
Applying JavaSpaces
507
8
Leveraging Robust Persistence: JavaSpaces as Network Object Storage
508
1
Leveraging Networked Concurrency Support: JavaSpaces for Synchronization Across Time and Space
508
1
JavaSpaces for Object Flow Systems Design
509
2
Distributed Messaging Systems (Chatline for Services)
511
1
Distributed Events with Indirect Semantics
512
1
Dynamic Producer/Consumer Based Systems
513
1
JavaSpaces for Building Compute Servers
513
2
Building a JavaSpace Based Compute Server
515
5
JavaSpaces in Review
520
3
Jini and JavaSpaces
521
2
Jini System Issues and Future Developments
523
1
Security and Jini Systems
524
1
Conceptual Roadblock: Jini is Only for Connecting Devices
525
1
Tools for Design, Development, and Debugging
526
1
Design Issues
526
6
Duplicated Meta-data
527
2
Serialized Object Identity
529
1
Coming Changes?
530
2
Section 3
532
231
Remote Access to Clinical Data
535
58
Background
535
9
Requirements
536
1
RACD in Action
536
1
The Initial Architecture
537
1
The Static Model
537
1
The Dynamic Model
538
2
Technology Selection
540
1
The Impact of Jini on the Initial Architecture
541
1
Unreliability
541
1
Scaling
542
1
Security
542
2
Experience
544
49
Implementation Notes
544
1
Building Jini Services
545
1
Implementing ActivatableServer
546
3
Implementing ActivatableServerSetup
549
4
Implementing JiniService
553
4
Supporting SSL with JiniService
557
1
Building Jini Clients
557
1
Implementing JiniServiceClient
557
4
Implementing JiniServiceConnection
561
5
A Fault Tolerant Jini Logging Service
566
9
Servlets as Jini Clients
575
2
Jini and the Internet
577
13
Conclusions
590
3
Large-scale Wish Fulfilment Support
593
28
Involvement in the Jini Community
594
1
Time Tracking
594
2
Server Architecture
596
4
Independence
596
1
Simplicity
596
1
Control
596
1
100% Uptime
597
1
Fault Tolerance
598
1
High Performance
599
1
Device Control Systems
600
3
Aggregation
601
1
Automation
601
1
Integration of Disparate Systems
602
1
Making it Work
603
4
Security
604
1
Implementation
605
2
Class Services
607
7
Using a Jini Class Loader
608
1
Implementation
608
6
Diagramming Technique
614
4
Services
614
2
JavaSpace Components
616
2
Conclusion
618
3
JWork Place: the Fragment Repository
621
52
An Introduction to JWorkPlace
622
1
What is a Code Fragment?
622
1
JWorkPlace Conception
623
1
General Requirements
623
2
The Architecture of JWorkPlace
625
42
The Entries Defining JWorkPlace
627
3
Defining Fragments Using XML
630
1
Building the Fragment Repository from JavaSpace Entries
631
3
JWorkPlace Scenarios
634
13
Client-Side Architecture - Events
647
6
Reviewing the Layered Architecture
653
6
The Server-Side Architecture
659
3
System Administration of JWorkPlace
662
4
Lessons Learned
666
1
JWorkPlace: Appendix A
667
4
Core methods supporting the Library Service
667
4
JWorkPlace: Appendix B
671
2
Steps and Scripts used to Start JWorkPlace
671
1
Windows NT
671
2
Jini on Wheels - the Car as a Mobile Infrastructure
673
32
Why This Case Study?
674
29
Case Description - Graded Ubiquitous Trip Support
675
1
Problem Statement
675
1
Solution
676
1
Company Interaction with GUTS
677
1
Customer Interaction with GUTS
677
1
Employee or Driver Interaction with GUTS
678
1
Graded Ubiquitous Trip Services Views
678
3
Wrap Up of Requirements
681
1
Technological View of the Solution
681
2
Application Architecture and Jini Services
683
1
The Services Environment
684
1
The Top-Level Object Model
684
5
The In-Car Part of GUTS
689
4
Technical Infrastructure
693
1
Learning Jini by Adding Complexity
693
3
Design and Implementation Issues
696
1
Effects of Events on Schedules
696
1
Human-Computer Interaction
696
1
In Vehicle Automation
697
1
Driver Assistance (DA) Systems
697
1
Mobile Services & Information (MSI)
698
1
Communication Costs
698
2
Lessons Learned
700
1
Possibility of Outsourcing Part of the Services
701
1
Shortened Development Cycle
701
1
We Didn't Build a New Case, But We Built it Better
701
1
The Connection is Made
701
1
Jini and Bluetooth Make the Perfect Couple
701
1
Easy Skills Development from Java to Jini
702
1
Risk Analysis
702
1
Partners and the Jini Community
702
1
Tools
702
1
Test Environment
702
1
Summary
703
2
Using Jini to Enable a Framework for Agent-Based Systems
705
58
Introduction
705
1
What Are Agents and Why Are They Needed?
706
2
Defining an Agent
706
1
Agents Versus Traditional Approaches
706
1
The Reasons for Using Agents
707
1
What Can Jini Offer an Agent-Based System
708
1
The Concepts Behind Paradigma
709
3
A Home Appliances Agent
712
6
Service Creation
714
1
Service Registration
714
1
Service Discovery
715
1
Controlling the Service
715
2
Why Do It This Way?
717
1
Paradigma Agent Hierarchy
718
1
Neutral Objects
719
25
Attributes
721
3
Capabilities
724
1
The Neutral Object Interface
725
1
Publishing a Neutral Object
726
7
Creating a Neutral Object
733
2
Browsing Neutral Objects
735
9
Agents
744
4
Instantiating Server Agents from Neutral Objects
746
2
Autonomous Agents
748
8
Autonomous Agent Capabilities
752
1
Interacting with Other Agents
753
2
A Snapshot of Paradigma
755
1
Conclusions
756
1
Resources
757
1
Types of Agent Systems
757
2
Information Management Agents
757
1
User-Interface Agents
758
1
Cooperative Distributed Problem Solving Agents
758
1
Enabling Technologies
759
4
Artificial Intelligence
759
1
Problem Solving and Planning
759
1
Learning
760
1
Expert Systems
760
1
Communicating Agents
761
2
Section 4: Appendices
763
97
Appendix A: Jini Core Interfaces
765
20
Core Package Overview
765
1
net.jini.core.lease
766
1
Lease
767
1
net.jini.core.event
768
1
RemoteEvent
769
1
RemoteEventListener
769
1
net.jini.core.discovery
770
1
LookupLocator
770
1
net.jini.core.entry
771
1
Entry
771
1
net.jini.core.lookup
772
1
ServiceItem
772
1
ServiceTemplate
773
1
ServiceRegistrar
774
3
net.jini.core.transaction
777
1
Transaction
777
2
NestableTransaction
779
1
TransactionFactory
779
1
net.jini.core.transaction.server
780
1
TransactionParticipant
780
1
TransactionManager
781
4
Appendix B: Remote Method Invocation API
785
14
java.rmi
786
1
Remote
787
1
RMISecurityManager
787
1
MarshalledObject
787
1
Naming
788
1
java.rmi.server
789
1
UnicastRemoteObject
790
1
java.rmi.activation
791
2
ActivationDesc
793
1
Activatable
794
5
Appendix C: RMI Activation Daemon
799
4
RMID Usage
800
1
Simple HTTP Daemon
801
2
Appendix D: Reggie Lookup Service
803
4
Appendix E: Mahalo Transaction Service
807
4
Appendix F: Mercury Event Mailbox Service
811
4
Appendix G: Fiddler Lookup Discovery Service
815
4
Appendix H: Norm Lease Renewal Service
819
4
Appendix I: Jini Helper Utilities and Services
823
20
Administration Utilities (net.jini.admin)
824
1
Administrable
825
1
JoinAdmin
825
1
Discovery Utilities (net.jini.discovery)
826
1
LookupDiscoveryManager
827
1
DiscoveryListener
828
1
Entry Utilities (net.jini.entry)
829
1
Event Mailbox Service (net.jini.event)
830
1
EventMailbox
830
1
MailboxRegistration
830
1
Lease Utilities & Services (net.jini.lease)
831
1
LeaseRenewalManager
831
2
LeaseListener
833
1
LeaseRenewalService
833
1
LeaseRenewalSet
834
1
Lookup/Join Utilities (net.jini.lookup)
835
1
JoinManager
835
2
ServiceDiscoveryManager
837
2
Standard Lookup Entries (net.jini.lookup.entry)
839
1
JavaSpace Service (net.jini.space)
840
3
Appendix J: Using Jini in Linux
843
6
Jini and Linux
844
2
Getting Help
846
3
Appendix K: UML Notation
849
6
Classes and Objects
849
1
Relationships
850
1
Inheritance
851
1
States
852
1
Object Interactions
853
2
Appendix L: Support, Errata and p2p.wrox.com
855
5
The Online Forums at p2p.wrox.com
856
1
How To Enroll For Support
856
1
Why This System Offers The Best Support
856
1
Checking the Errata Online at www.wrox.com
857
1
Wrox Developer's Membership
857
1
Finding an Erratum on the Web Site
858
1
Add an Erratum: E-Mail Support
859
1
Customer Support
859
1
Editorial
859
1
The Authors
860
1
What We Can't Answer
860
1
How to Tell Us Exactly What You Think
860