COMP 4—Power Tools for the Mind 1What’s in the box?

The Net, the Web, & Hypertext

andCreating your Web pagesWhat we’ll cover today

• How to create your own Web pages

• The Net, the Web, and Hypertext (most from Text reading)

• How the Web and hyperlinks work

COMP 4—Power Tools for the Mind 2What’s in the box?

Net, Web, and Hypertext

Good, comprehensive, and comprehensible textbook coverage (Chap 6 A, B, C)!

Consequently, much will not be covered in lecture.

Count on multiple-choice exam questions !

• Know what each is (and what it is not!) and the difference between them.

• Note: Pay particular attention to figures: 6-2 and 6-9

Also

COMP 4—Power Tools for the Mind 3What’s in the box?

Also, be sure you can define:– HTML and HTML tags– Web browsers and servers (& know the difference)– Web plug-ins– HTTP (a protocol)– Cookies and privacy– Web page authoring programs– Web page components (I’ll cover some shortly)– Stylesheets (just what they are)– Links, buttons, hotspots– Tables and frames– DHTML; XML– Javascript and Java applets; ActiveX

COMP 4—Power Tools for the Mind 4What’s in the box?

What is the Internet?• Interconnected networks

– Computers connected to a loose association of thousands of different networks, run by different companies and using different technologies, all connected together in a giant network of networks.

• 1996: Internet becomes known to general public…

In 1995: only 44% of those surveyed said they had even heard of it.

by NOV 1996: 93.5%

For interesting statistics, visit: www.nua.ie/surveys/

COMP 4—Power Tools for the Mind 5What’s in the box?

The Internet: – information container & delivery

mechanism;– supports on-line

communities/communications.

Plenty of URBAN LEGENDS and SCAMS:

SCAMBUSTER SITES:

www.scambusters.orgwww.urbanlegends.comhoaxbusters.ciac.orgwww.snopes.com

COMP 4—Power Tools for the Mind 6What’s in the box?

What is the WEB?• It is not the Internet ! It is a subset; a way to

use the Internet to share documents.• World Wide Web

– A high-profile example of a hypertext • Resource retrieval system of linked computer-based documents that allows user to click on a region (anchor

or hyperlink) to obtain yet another document.

– Hypermedia: information in different formats:• Can link to images, sound files, animations, text.…

– Click on a hyperlink: request for information

COMP 4—Power Tools for the Mind 7What’s in the box?

• Web needs it own protocol for requesting, providing, & displaying WEB information (Web pages) correctly:

– http: Hypertext transport protocol– a protocol layered on top of the Internet’s protocol.

• To ensure successful transmission of request & transmission of the data, in response.

– Web servers run http-compatible server software.

– Your PC runs client software that can request, interpret, and display the transmitted information

•Browser software

COMP 4—Power Tools for the Mind 8What’s in the box?

What does clicking on a web page hyperlink do?

Browser (client) software makes a request to server software, over the network.

Server software sends requested information back to your browser.

Browser loads the information to local RAM and to your local hard drive. Term for that?Term for that?

Now what happens if you click on the same URL?

What happens if you select RELOAD or REFRESH?