Packt Publishing Logo SSL VPN: Understanding, evaluating, and planning secure, web-based remote access
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Book Contents Home

Introduction
1: Introduction to SSL VPN
2: SSL VPN: The Business Case
3: How SSL VPNs Work Free Chapter
4: SSL VPN Security
5: Planning for an SSL VPN
6: Educating the User
7: Legacy Data Access
8: The Future of SSL VPN Technology
Appendix A: A Review of TCP, IP and Ports
Appendix B: SSL VPN Gateways
Index

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Chapter 7: Legacy Data Access
A computer, according to Webster's dictionary, is a machine or person that may be designed to carry out complex and lengthy mathematical analytical operations very rapidly, to control industrial operations, or to undertake clerical work. According to this definition, everyone who works for a government is, in essence, himself/herself a computer. So are the clerks who check you out at your local grocery store!

Keeping this in mind, it is easy to see that the true genealogical history of computing can be traced back to the formation of math as a tool in humankind's daily life. The first milestone of computing history might be regarded as the invention of the Abacus. Having emerged about 5,000 years ago in China, the abacus is still in use today.

Having a simple but reliable system of performing basic mathematical operations, this device was used for daily commerce by thousands of people throughout the Far East and, eventually, Asia Minor as well. Users were able to make computations utilizing a system of sliding beads arranged on a wooden rack, allowing early merchants to keep a track of trading transactions, in ways they had never been able to before. From those early roots, humankind was eventually able to manifest greater power in the computers of today.

This new age of computing began in the 1950s when John Backus and IBM developed the FORTRAN computer programming language. This first modern programming software provided mechanisms and tools to develop business applications. The next step came with the development of the ARPANET.

ARPANET, essentially an early and simpler version of the modern Internet, provided a mechanism for computers to communicate with each other through a set of interconnecting networks.

At about the same time computer commerce communication protocols were introduced. One in particular was Electronic Data Interchange (EDI). The standard that emerged from this protocol was developed in the 1980s and was known as ANSI X12. This brings us to the present day.

With more than 800 million users, the Web has mutated into a multitude of tools for business and personal use. The abacus, though a long way from the Internet, was still both hardware and software, requiring an end user to operate the system. The Internet is not dissimilar in that, it comprises hardware, software, and end users.
  • Chapter 7: Legacy Data Access
    • Computing Elements
    • Applications
      • Commercial Off-The-Shelf (COTS)
      • Custom Programs
      • Legacy Applications
    • The Web Challenge
      • Direct Access
        • Scrape the Screen
        • Awareness
      • SSL VPN with Middleware Access
    • Meeting the Challenge
      • Secure Access
    • Tunneling to the Other Side
      • Tunneling Techniques
      • Lotus Notes Tunnel
        • Tunneling Steps
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