Chapter16 - Chapter 16: T he Wor ld Wide Web T he Wor ld...

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Unformatted text preview: Chapter 16: T he Wor ld Wide Web T he Wor ld Wide Web applies point-and-click hyper media application softw ar e to facilitate accessing documents on the I nter net via T CP-based pr otocols. Cl i ck on thi s pi ece of Type i and you'r e hyper text,n a keywor d and cl i ck the "Go!" taken to... pushbutton, and Cl i ck on thi syou'r e taken to... pushbutton, and you'r e taken to... And w ith additional dow nloaded softw ar e, elabor ate Web sites that include mor e than text and simple images can be accessed. Chapt er 16 T he Wor ld Wide Web Page 1 H Typer softw ar e defining the for mat of r P r otocol om a Web T ext T r anspor t equests r elayed fr H T P is the br ow ser to a Web ser ver , as w ell as the r eplies r elayed fr om the ser ver to (HbrLT T .P) M ar k up L anguage) i s the the ow ser H T M (H yper T ext standar d used to w r ite Web pages; it doesn't r equir e specific for matting i nstr uctions, so tw o br ow ser s may display a page di ffer ently. <html><head><title>Welcome to IEEExpl</title></head> <body> <table width="550" border="0" cellspacing="0" cellpadding="0" align="center"> <tr><td valign="top"> <p><font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b> <font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b> <font size="5" color="#3333CC"><img src="/images/subidinfmast_01.gif" width="550" height="39" vspace="3" hspace="0" border="0" alt="IEEE xpl Subscription Access Information" usemap="#Map"></font></b></font> <map name="Map"> <area shape="rect" coords="6,5,182,31" href="http://ieeexpl.ieee.org"> </map> </b></font></p> <br> <table width=510 border=1 cellspacing=0 cellpadding=5 bordercolor=#CCCCCC align=center><tr><td> <font face=Verdana, Arial, Helvetica, sans-serif size=2 color=#3333CC> <b>Your institution subscribes to:</b></font></td></tr><tr><td bgcolor=#E8E8E8><strong> <font size=2 face=Verdana>&nbsp;&nbsp;&nbsp;</font><font face=Verdana, Arial, Helvetica, sans-serif size=2 color=#3333CC>&#149;<b></b></font><font size=2 face=Verdana> Search Xplore Database</font></strong></td></tr></table><br> <table width=510 border=1 cellspacing=0 cellpadding=5 bordercolor=#CCCCCC align=center><tr><td> <font face=Verdana, Arial, Helvetica, sans-serif size=2 color=#3333CC><b>Your institution subscribes to:</b> </font></td> </tr> <tr> <td bgcolor=#E8E8E8><strong><font size=2 face=Verdana>&nbsp;&nbsp;&nbsp; </font><font face=Verdana, Arial, Helvetica, sans-serif size=2 color=#3333CC>&#149;<b> </b> </font><font size=2 face=Verdana>IEEE All Society Periodicals Package (ASPP) </font></strong></td> </tr> <tr> <td bgcolor=#FFFFFF> <blockquote> <blockquote> <p><font face=Verdana size=2><b><font color=#3333CC>Your online subscription includes access to the abstracts and full-text of IEEE journals, transactions, and magazines published since 1998:</font></b> </font></p> <p><font size=2 face=Verdana>&nbsp;&nbsp;&nbsp;<font face=Verdana, Arial, Helvetica, sans-serif size=2 color=#3333CC><b>&#149;</b> </font> <a href=/xpl/ieeejrns.jsp?hr=1>IEEE journals, transactions, and magazines</a> </p> </blockquote> </blockquote> </td> </tr> </table><br> <table width="500" border="0" cellspacing="0" cellpadding="0" align="center"><tr> <td> <p><font face="Verdana" size="2"> In addtion to the above, you may purchase individual IEEE journal/magazine articles and conference papers that are not included in your institution's online subscription. If you want a copy of an article or paper, first check with your librarian for a copy available locally.</font></p> <p><font face="Verdana" size="2"><font color="#000000">Any questions? <a href="/xpl/techform.jsp"> Contact IEEE Customer Service</a>.</font></font></p></td></tr></table><br> <table width="500" border="0" cellspacing="0" cellpadding="0" align="center"> <tr> <td valign="top"> <div align="right"> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><br><A href='javascript:window.close();'> <img src="/images/backbutton.gif" width="165" height="34" vspace="0" hspace="0" border="0" alt="Close this Window"></A> </font></div></td></tr></table></td></tr></table></body></html> Chapt er 16 T he Wor ld Wide Web Page 2 Extensible M ar k up L anguage U nlik e H T M L , XM L allow s user s to include content(XM L ) mation in their files, facilitating its being specific infor for matted to suit var ious display devices. A job vacancy at the depar tment of T our ism is added to the job database. XM L technology stor es the data separ ately fr om the pr esentation, allow ing for a var i ety of platfor ms. T he vacancy is displayed ...can be accessed by on the job center k iosk ... mobile devices... ...and is displayed on the D epar tment of Chapt er 16 T he Wor ld Wide Web Page 3 U nifor m Resour ce L ocator s A U RL specifies (U RL s) thr ee pieces of infor mation: 1. T ype of file tr ansfer 2. N ame of computer 3. N ame of file D iffer ent types of file tr ansfer : http:// - hyper text tr ansfer pr otocol ftp:// - file tr ansfer pr otocol telnet:// - opens a telnet session gopher :// - tr ansfer file fr om a gopher ser ver mailto: - open a mail session F or example: http://w w w .cs.siue.edu/under gr ad/BS/files/pr er equisites.pdf 1. http:// - type of file tr ansfer 2. cs.siue.edu - name of the computer 3. /under gr ad/BS/files/pr er equisites.pdf - location of the file on the computer Chapt er 16 T he Wor ld Wide Web Page 4 Web Br ow sing I nput fr om mouse & keyboa r d Br owser Contr ol l er Cl i ent softwa r e r unni ng on the wor ksta ti on I nter pr eti ng downl oa ded Web pa ges a nd fi l es H TML I nter pr eter D i spl a y D r i ver D i spl a y D r i ver J a va I nter pr eter Output to user 's di spl a y H TTP Cl i ent FT P Cl i ent I ssui ng r equests for exter na l fi l es N etwor k I nter fa ce Communi ca ti ons wi th r emote Web ser ver Chapt er 16 T he Wor ld Wide Web Page 5 I nter net Sear ch Engines Sear ch engines use "spider " pr ogr ams to "cr aw l" thr ough the Web, building a list of w or ds. Some follow ever y link on ever y home page. Some ignor e link s that lead to gr aphics, sound, or animation files, or to new sgr oups. Some concentr ate pr imar ily on the most popular Web pages. Chapt er 16 T he Wor ld Wide Web Page 6 Compar ing Sear ch Engines Shar e of Sear ches Secur ity I ssues Red = distr ibute adw ar e, send a high volume of spam, or mak e unauthor ized changes to a user 's computer Yellow = send a high volume of "non-spammy" email, display many popup ads, or pr ompt a Chapt er 16 T he Wor ld Wide Web Page 7 ...
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