The X Window System for displaying graphical user interfaces on UNIX and Linux systems has just been re-architected to support enterprise-class distributed applications across LANs, WANs, and the Internet. This is the first and only authoritative guide to the new X Window System, codenamed Broadway, and officially titled X11R6.3. Discover how Broadway can allow any user to access any application from anywhere on the Internet, while significantly improving the performance of existing enterprise applications. Learn how Broadway has evolved from its X roots; review its components, security features, and Internet-focused architecture; and understand the tasks required to enable enterprise applications to execute remotely across the Internet. Finally, compare Broadway with JavaaA A based solutions, and understand how Broadway and Java can work together. The book contains more than 50 figures and illustrations demonstrating Broadway enterprise solutions -- with corresponding sample code available on the Web. For all IT managers, architects, designers, developers, and administrators of large-scale distributed applications and environments.
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Book Description
Editorial Reviews
From the Inside Flap
The Internet has not only changed the way users interact with computers, it has also revolutionized the way designers and developers construct and deploy software systems. The old, monolithic design rules no longer apply. To capitalize on today's distributed technologies, programmers and system engineers must alter fundamentally their approach to application design.
That notwithstanding, the advantages provided by the new deployment architectures should not be limited solely to new applications. Rather, information technology (IT) professionals should be able to integrate existing applications into these new design paradigms as well. However, to achieve such a goal, IT professionals require a tool that integrates new designs and applications with existing legacy systems.
To this end, this book describes X11R6.4-the X Window System's new architecture-as a complete Internet solution. Assigned the code name Broadway, X11R6.4 provides IT mangers and developers a number of important advantages. First, it allows existing enterprise applications to move seamlessly from a local area network to a wide area network to the Internet. This echoes X Window's original design imperative. Specifically, Broadway allows any user to access any application, from anywhere on the Internet. Second, Broadway increases significantly the display performance of existing enterprise applications. For example, Broadway includes several features (most notably low-bandwidth X) that improves the performance of X-based applications. In addition, Broadway provides its users program continuity regardless of location. As a result, application screens and interfaces look the same regardless of the user's location (either inside or outside the firewall).
Note that developers gain these advantages without having to rewrite-or even recompile-existing programs. This feature alone will save IT organizations thousands of dollars.
Why is this important? All organizations have finite IT budgets. Nonetheless, to remain competitive in today's markets, companies must provide their employees with every possible technological advantage. Obviously, every dollar spent porting old applications to new environments is a dollar that is not available for the development of new tools. Broadway maximizes an organization's ability to extend its technological arsenal by minimizing-indeed, eliminating-the cost of reengineering. In addition, Linux (a UNIX variant) is becoming the platform of choice in many IT shops. Thus, native, efficient support for newly developed, distributed X-based applications has become an imperative for many development organizations.
There is another reason why the new development architectures are important: Development organizations will no longer need to tolerate a one-vendor, one-platform solution. Modern IT solutions comprise an integrated suite of hardware and software components: some purchased, some leased, some developed. Indeed, one of the problems confronting developers new to this environment is managing the overwhelming wealth of choice. Who Should Read this Book?
This book describes X11R6.4 as a complete Internet solution. It discusses its architecture, its major components, and most importantly, its advantages for developing and deploying distributed applications. In addition, the book includes chapters covering administration, migration, and a comparison of X11R6.4 with other Internet technologies (such as Java). The text also addresses the many tools X11R6.4 provides to protect investments in legacy systems and applications.
Thus, readers of this book include architects, designers, developers, and administrators of large-scale, distributed applications and environments. Each type of reader will gain an understanding of Broadway's benefits, and will acquire insight into how they can harness this exciting new technology to their immediate advantage.
In addition, this book benefits IT managers who are responsible for developing enterprisewide deployment strategies and architectures. They will learn how to extend the life span of their legacy applications by making them available in a manner consistent with new deployment architectures and technologies. This saves time, money, and effort that management can direct toward the development of new systems and applications. Organization
The book begins by describing the need and historical background involved in developing distributed Internet-based applications. Chapter 1 describes the need for distributed processing. Chapter 2 puts Broadway in perceptive by describing its X Windows roots. The text then describes X11R6.4: Chapter 3 presents an overview of Broadway and discusses its technological and economic advantages. Chapter 4 provides a detailed discussion of the administrative tasks required that allow enterprise application to execute remotely via the Internet. In Chapter 5, the book closes with a discussion of Broadway interoperability with other technologies: Java and Microsoft's Terminal Server. This provides readers a comparison of the approaches and a conceptual understanding of Broadway's role vis-a-vis new technologies.
Finally, three appendices describe several important aspects of X11R6.4: the Application Group Extension, the Low-Bandwidth X Extension, and RX.
020118463XP04062001
From the Back Cover
The New X Window System presents complete and authoritative information on X11R6.4, the new X Window technology that enables enterprise systems--both legacy and newly developed--to run over the Internet. Code-named Broadway, this powerful technology holds many advantages for organizations. It enables X applications to move seamlessly from LANs to WANs to the Internet without the need to rewrite or even recompile, saving enterprises many thousands of dollars. Broadway also allows users access to enterprise programs from anywhere on the Internet, offers a consistent application interface--whether inside or outside a firewall--and greatly improves the performance of X applications.
Geared for architects, designers, developers, and administrators, The New X Window System introduces X11R6.4, highlights its many advantages, and shows how to harness the technology to the greatest advantage. Readers will find a detailed description of the X11R6.4 architecture, its various components, migration, and the administration tasks required to enable an enterprise application to execute remotely via the Internet. The book also offers a comparison of Broadway to other Internet solutions, most notably Java(TM). Specific topics covered include:
The rationale behind X11R6.4 and its evolution from earlier X technology Broadway's low-bandwidth X (LBX) technology for enhancing performance X11R6.4 HTTP/HTML extensions Web server and browser administration X11R6.4 security, including access control lists (ACLs) and magic cookies Interoperability with Java and the Microsoft Terminal Server
Written by a leading authority on X, The New X Window System demonstrates Broadway's complete Internet solution--one that is easily deployed and maximizes an organization's investment in its information technology.
020118463XB04062001
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