Chapter 11Internet Applications: Communication and ConnectionSearch EnginesSlide 4PortalsEmail on the InternetSlide 7Mailing Lists & Network NewsReal-Time CommunicationRules of Thumb: NetiquetteEmoticonsPush TechnologyPeer-to-Peer and Grid ComputingIntranets, Extranets and Electronic CommerceSlide 15Slide 16Web ServicesThe Evolving InternetInternet Issues: Ethical and Political DilemmasInternet Everywhere: The Invisible Information InfrastructureSlide 21 2002 Prentice HallChapter 11From Internet to Information Infrastructure 2002 Prentice Hall 2 Internet Applications: Communication and ConnectionSearch engines are designed to make it easier to find information on the Web.web crawlers or spiders --software robots that systematically search the webmeta-search – conduct parallel searches using several different search engines and directories 2002 Prentice Hall 3 Search EnginesSome search engines use keywords and Boolean logic to conduct searches 2002 Prentice Hall 4 Search EnginesOther search engines allow searches by using a hierarchical directory or subject tree 2002 Prentice Hall 5 PortalsWeb entry stations that offer quick and easy access to a variety of services. Consumer portals includes search engines, email services, chat rooms, references, news and sports headlines, shopping malls and other servicesCorporate portals on intranets serve the employees of particular corporations Vertical portals are targeted at members of a particular industry or economic sector 2002 Prentice Hall 6 Email on the InternetWhat appears on the screen depends on the type of Internet connection you have and the mail program you use.Popular graphical email programs include Eudora, Outlook and Netscape Communicator. 2002 Prentice Hall 7 Email on the InternetEmail formats include:ASCII text--can be viewed by any mail client programHTML--displays text formatting, pictures, and links to Web pages 2002 Prentice Hall 8 Mailing Lists & Network NewsMailing lists allow you to participate in email discussion groups on special-interest topics. A newsgroup is a public discussion on a particular subject consisting of notes written to a central Internet site and redistributed through a worldwide newsgroup network called Usenet 2002 Prentice Hall 9 Real-Time CommunicationUsers are logged in at the same time.Instant Messaging for exchanging instant messages with on-line friends and co-workers Internet telephony (IP telephony) for long-distance toll-free telephone serviceVideoconferencing for two-way meetings 2002 Prentice Hall 10 Rules of Thumb: NetiquetteSay what you mean and say it with care.Keep it short and to the point.Proofread yours messages.Learn the “nonverbal” language of the Net.Keep your cool.Don’t be a source of spam (Internet junk mail).Lurk before you leap.Check your FAQs.Give something back. 2002 Prentice Hall 11 Emoticons:) Happy person:( Sad person:-) Happy person with a nose:-( Sad person with a noseBizarre Emoticons>8-O-(&) Person just realizing that he or she has a tapeworm:---( Person who is sad because he or she has a large nose.-) Person who can still smile despite losing an eyeball~oE]:-| Fisherperson heading for market with a basket on his or her head containing a three-legged octopus that is giving off smell rayshttp://www.randomhouse.com/features/davebarry/emoticon.html ;-) Person winking :-D Person laughing :-| Person feeling so-so :-o Shocked person 2002 Prentice Hall 12 Push TechnologyThe Web was built with pull technology—browsers on client computers “pull” information from server machines. Browser asks for informationWith push technology, information is delivered automatically to the client computer.New product descriptionsAutomatic software upgradesUpdated news 2002 Prentice Hall 13 Peer-to-Peer and Grid ComputingPeer-to-Peer (P2P) computing - users share music, movies, and other files without going through a central directory. Grid computing - anyone can plug in from anywhere and rent processing power and software from anywhere on the Net 2002 Prentice Hall 14 Intranets, Extranets and Electronic CommerceIntranets are self-contained intra-organizational networks that offer email, newsgroups, file transfer, Web publishing and other Internet-like services.Firewalls prevent unauthorized communication and secure sensitive internal data 2002 Prentice Hall 15 Intranets, Extranets and Electronic CommerceExtranets are private TCP/IP networks designed for outside use by customers, clients and business partners of the organization.electronic data interchange (EDI) - a decade-old set of specifications for ordering, billing, and paying for parts and services over private networks 2002 Prentice Hall 16 Intranets, Extranets and Electronic CommerceElectronic commerce involves business transactions through electronic networks.Business-to-business (B2B) e-commerce - transactions that involve businesses providing goods or services to other businesses Business-to-consumer (B2C) e-commerce - transactions that take place on the Internet, rather than an extranet, because consumers don’t have access to private extranets 2002 Prentice Hall 17 Web ServicesWeb services involve new kinds of Web-based applications that can be assembled quickly using existing software componentsExamples: plug a shopping-cart component into an existing Web sitedesign applications that can be accessed through a variety of Web-enabled devices 2002 Prentice Hall 18 The Evolving InternetInternet2 launched by the government and various corporations in 1998 to provide faster network communications for universities and research institutions. Next Generation Internet (NGI), will consist of a nationwide web of optical fiber integrated with intelligent management software to maintain high-speed connections. 2002 Prentice Hall 19 Internet Issues: Ethical and Political DilemmasFiltering software to combat inappropriate contentDigital cash to make on-line transactions easier and saferEncryption software to prevent credit card theft Digital