Chapter00 - Introduction to JavaScript Programming With XML...

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Introduction to JavaScript Programming With XML and PHP Creating Interactive Web Pages Elizabeth Drake
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Computer Basics Chapter 0
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0.1 A Brief History of Computers
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What is a computer? Computer: a mechanical or electronic device used to efficiently store, retrieve, manipulate large amounts of information Analytical Engine: designed by Charles Babbage and Ada Byron in mid- 1880s ENIAC: world’s first fully operable computer, built at U of Pennsylvania by John Mauchly and Presper Eckert in 1945 Transistor: developed in late 1940s by William Schockley, John Bardeen, and Walter Brattain at Bell Labs transformed development of computers
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0.2 A Brief History of the Internet
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Packet Switching and TCP/IP Packets: web pages are broken into packets which are sent to different servers ISP: Your Internet Service Provider (ISP) requests a page, the page’s server breaks it into packets and sends them out. When received on your ISP’s server, they are reassembled and sent to your computer. TCP: Transmission Control Protocol (TCP) breaks the web page into packets. IP: Internet Protocol routes the packets. IP address: Each device connected to the Internet has a unique IP address which is either static or dynamic.
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What is a URL? WWW: The World Wide Web (WWW or web) is a system of interlinked hypertext documents accessed via the Internet URL:
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