Welcome to CMPE003 Personal Computers: Hardware and Software

1. Welcome toCMPE003Personal Computers: Hardware and Software Dr. Chane Fullmer Fall 2002 UC Santa Cruz

2. Assignments • Homework #4 – Design your own resume • Must use a Word Processor (ie, M$ Word) • Notepad will not suffice. • Due Today!!

3. Class Information • Midterm #2 • Monday – November 4, 2002. • ID required. • Covers Chapters 6 through 10. • Book reading plus lectures. • Multiple choice • Requires Scantron #F-1712-ERI-L (pink) • ~50 questions • No makeups after the fact

4. The Internet:A Resource for All of Us Chapter 8 Part B

5. Getting Started • Computer with a modem or NIC • Internet service provider (ISP) • Browser • Related software

6. Internet Service Provider • Vehicle to access the Internet • Provides • Server computers • Email, News, etc.. • Software to connect

7. Wireless Internet Access • Supports mobile handheld devices • Text pagers • PDAs • Pocket computers • Web-enabled cellular phones • Applications • E-mail • Checking weather • Making airline reservations

8. Wireless Internet Access • Need • Account with wireless access provider • Cellular modem card or adapter • Slow download speeds • Wireless Application Protocol (WAP) • Convert web pages into format for mobile devices • Resized for limited display area • Fewer graphics transmitted

9. Browser Netscape Communicator Microsoft Internet Explorer Mozilla

10. Browser • Used to explore the Internet • Dials the ISP • Display web pages

11. URL Textbox BrowserParts of the window Welcome Banner Control Panel Menu Bar Buttons Browser Logo Bookmarks “Hot List” Scroll Bar Status Line Display Window

12. BrowserFunctions and Features • Browser display window • Displays contents of web page from each Internet site visited • Screen limits how much of the site you can view at a time. The page can be scrolled using the scroll bar to see its entire contents • Status line – progress of data being transferred and other messages

13. BrowserFunctions and Features • Welcome banner on title bar • Browser logo – animation indicates you are in the process of moving to a new site • Hot list • Bookmark • Favorites • Store your favorite URLs • Browser control panel – menus and buttons

14. BrowserMenus and Buttons • Pull-down menu • Buttons • Convenient shortcuts for commonly used functions • Click button rather than locate command from pull-down menu

15. Browser SupportFrames • Divides page into rectangular sections • Each section displays web pages independently • Several small pages on one screen • Can be scrolled independently • Can be replaced with other pages independently • Not all browsers support frames

16. Plug-ins • Software that increases the functionality of a browser • Audio-video • Image viewing • Download from web sites • Install • Example • Adobe Acrobat Reader • Shockwave

17. Programming Java • Write software that is machine independent • Programming language • Dancing icons • Sound clips • Flashing messages • Banners that scroll • Applets – Permits dynamic web pages • Display animations • Receive input • Perform calculations

18. Programming ActiveX Controls Capabilities similar to Java Browser must be enabled to support applets / ActiveX Controls Security issues

19. Moving Between Sites • Clickable categories in the browser • Sports • Weather • News • Technology • Comic strips • Enter the URL in the address text box and press <Enter>

20. URLUniform Resource Locator • Unique address of a web page or file on the Internet • Case-sensitive http://domain-name.top-level-domain/last-section

21. Processing RequestsURL • User enters a URL • User computer sends request to the ISP server • ISP server sends request across networks of TCP/IP computers • Destination site is reached • Content is transmitted back to your computer (process in reverse)

22. Searching the Internet Search engine • User specifies a search request • Browser links to Search Engine • Request returns matching pages based upon the Search Engine’s database • Results presented

23. Processing RequestsSearch Engine Database • Search Engine builds database • Searchable terms • Related web sites • Spider, robot, bot • Follows links across the web • Automatically indexes pages to a database • One word • All words • Pages may be submitted by the owner

24. Processing RequestsSearch Engine Database • Request same search using different engines yields different results • Databases built independently • Size • Content • Search methodology • Metasearch – atomically puts the same request to several search engines

25. Processing RequestsDirectory vs. Search Engine • Directory • Human involvement • Sites organized by content category • May concentrate on specific content areas • Subjective decisions regarding inclusion and importance • Search Engine • Spider, robot, or bot automatically builds database • Index on a few keywords • Index on all words on web page

26. Processing RequestsSearch Engine Limitations • Index only a fraction of the Web • Approximately 20% to 33% of sites • More web pages added daily • Solution • Same request to several search engines • Metasearch

27. Directories Yahoo! NetGuide Metasearch Sites MetaCrawler Dogpile Search Engines AltaVista Excite Google HotBot Infoseek Lycos Northern Light Search Tools

28. Refine the Search • Add words • Enclose words in “quotes” • Use Boolean logic • Examples • “World Trade Center” • Jordan AND NOT Michael

29. Other Uses of the Internet • Newsgroups • FTP • Telnet • E-mail • Internet Relay Chat (IRC)

30. Newsgroups / Usenet • Large bulletin board divided by category • Posting and reading of messages that focus on specific topics • Over 20,000 newsgroups • Functions • Conversation • File download • Newsreader software required (included with most browsers)

31. Newsgroup Operations • Lurking • Posting material • Inappropriate material • Flame • Flame war • Moderated newsgroup

32. FTP ClientFile Transfer Protocol • Download files to your local computer • Upload files to another computer • Requirements to download file • Permission to download from a site • File is available for copying • Anonymous FTP – do not need to identify yourself to the remote computer • (But we do know your IP address)

33. Public Archives Sounds Free files provided by educational institution or the government Images Graphics Programs Text

34. Telnet/SSH • Use your PC as a terminal providing remote access to another computer • Permits • Log on to a host • Use as if you are sitting at a local terminal • Need account on the host system • Telnet software required (provided with most browsers) • SSH available free on-line – must be installed

35. e-mail client • Send/receive written messages • Most used feature of the Internet • Mail server – Collects and stores e-mail • Mailbox – Assigned to each user • E-mail address • User name • @ • Domain of the mail server • bob@cruzio.com

36. Retrieve Create Send Store Print Delete Address book Attach files Filters e-mailClient Software Functions

37. IRCInternet Relay Chat

38. Not Quite Perfect Yet • Unregulated • Useless web sites • Misinformation and misstatements on web sites • Concern over government censorship • Security & Privacy Issues

39. Not Quite Perfect YetSocial Issues • Behavior problems • Who is out there? • What are they doing? • Netiquette • Suggestions for appropriate behavior • Example: TYPING IN CAPS is shouting

40. Enjoy the Weekend