Industrial
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On the Internet, when you want to retrieve a document from another computer, you request a service from this computer. Your computer is the client, the computer on which the information you want to access is stored, is called the
A common set of standards allows the exchange of data and commands independent from locations, time, and operating systems through the Internet. These standards are called communication protocols, or the Internet Protocol Suite, and are implemented in Internet software. Sometimes the Internet Protocol Suite is erroneously identified with
Any information to be transferred is broken down into pieces, so-called packets, and the Internet Protocol figures out how the data is supposed to get from A to B by passing through routers.
Each packet is "pushed" from router to router via
The technique of breaking down all messages and requests into packets has the advantage that a large data bundle (e.g. videos) sent by a single user cannot block a whole network, because the
One of the Internet's (and of the Matrix's) beginnings was the
Routing around depends on the location of the interruption and on the availability of intersecting points between networks. If, for example, an E-mail message is sent from Brussels to Athens and in Germany a channel is down, it will not affect access very much, the message will be routed around this damage, as long as a major Internet exchange is not affected. However, if access depends on a single backbone connection to the Internet and this connection is cut off, there is no way to route around.
In most parts of the world the Internet is therefore vulnerable to disruption. "The idea of the Internet as a highly distributed, redundant global communications system is a myth. Virtually all communications between countries take place through a very small number of bottlenecks, and the available bandwidth isn't that great," says Douglas Barnes. These bottlenecks are the network connections to neighboring countries. Many countries rely on a one single connection to the Net, and in some places, such as the Suez Canal, there is a concentration of fiber-optic cables of critical importance.
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TCP and IP are the two most important protocols and communication standards. TCP provides reliable message-transmission service; IP is the key protocol for specifying how packets are routed around the Internet.
More detailed information can be found
A smart card is a credit-card size plastic card equipped with a microchip. this allows it to store a lot more data than a regular magnetic stripe, and to be recharged. Smart cards are most commonly used for electronic payment, phone calls and other day-to-day applications, but their potential lies in their versatility. Different type of data may be stored on the same smart card. The business expectation of the industry are ambitious, with expectations of an annual turnout of 2.7 bn smart cards by the year 2003.
American corporation that was the world's largest automotive manufacturer and perhaps the largest industrial corporation throughout most of the 20th century. It was founded in 1908 to consolidate several motorcar companies and today operates manufacturing and assembly plants and distribution centers throughout the United States and Canada and many other countries. Its major products include automobiles and trucks, a wide range of automotive components, engines, and defense and aerospace material. In 1996 it sold Electronic Data Systems, and in 1997 it sold the defense units of its Hughes Electronics subsidiary to the Raytheon Company, thus leaving the computer-services and defense-aerospace fields in order to concentrate on its automotive businesses. The company's headquarters are in Detroit, Michigan.