The Intranet A local area network (LAN) that is often A local area network (LAN) that is often used solely within a company or organization. It uses the same technology as that used for the Internet. Statistics indicate that intranets are growing Statistics indicate that intranets are growing much more rapidly than than their internet counterparts.

Other Services Available on the Internet a service that permits one to send a message another person, a group, or a computer another person, a group, or a computer program program Newsgroups: electronic bulletin boards where messages can be posted by anyone for anyone messages can be posted by anyone for anyone else to read; usually focused on a particular else to read; usually focused on a particular topic topic Listservs: a service that posts messages from registered members to all other members; unlike bulletin members to all other members; unlike bulletin boards, messages are sent directly to member boards, messages are sent directly to member sites. sites.

Other Services Available on the Internet File Transfer (FTP): used to transfer data files (rather than messages) between computers; unlike than messages) between computers; unlike http, you can upload files to a server http, you can upload files to a server Telenet: allows a user at one site to log in to and run programs on a remote computer; an example programs on a remote computer; an example would be accessing a library’s computerized would be accessing a library’s computerized data from home data from home Search Engines: a service that automatically searches for specified information on remote computers for specified information on remote computers

Other Web-Specific “Languages” Java: a language like html that is especially powerful in adding sound, animation, and interactivity to in adding sound, animation, and interactivity to web pages web pages Active X: a system of controls that can be used to incorporate external documents -- in their incorporate external documents -- in their native formats -- into Web pages; works only native formats -- into Web pages; works only on Windows machines on Windows machines Applets: a program written in Java and embedded in an html document; they run automatically an html document; they run automatically when the web page is viewed when the web page is viewed

Other Web-Specific “Languages” VRML: Virtual Reality Modeling Language -- the 3D language of the Web; it provides Web 3D language of the Web; it provides Web pages with three-dimensional data pages with three-dimensional data CGI Scripts: Common Gateway Interface -- a method of programming web sites for things like of programming web sites for things like on-line forms; uses script programs that run on-line forms; uses script programs that run on the server computer rather than Java-like on the server computer rather than Java-like programs which run on client computers programs which run on client computers

Unix An operating system that is used by many servers. An operating system that is used by many servers. It’s command set language is pretty complex and It’s command set language is pretty complex and hard to learn (nonintuitive) but it has proved extremely capable. The server here at NEIU runs on this system. The server here at NEIU runs on this system. You will usually find it on a mainframe computer. You will usually find it on a mainframe computer.

Pl ug-Ins Sooner or later, you will probably run into the following message: “This page contains information of a type that can only be viewed with the appropriate plug-in. What do you be viewed with the appropriate plug-in. What do you want to do? Plug-ins are little pieces of software that make special things happen. They usually can be downloaded for free. Examples: Real Audio: plays real-time audio files Shockwave: plays Authorware & Director files Acrobat Reader: shows files in the Adobe portable document format (PDF) document format (PDF)

Downloading Downloading: loading a copy of a plug-in or other file from the web onto your computer the web onto your computer You need to choose the file that is appropriate for your You need to choose the file that is appropriate for your type of system. type of system. You will usually need to uncompress the file after down- You will usually need to uncompress the file after down- loading it. loading it. Macs -- Netscape automatically installs StuffIt Expander PCs -- you must download either Winzip ( or PKUNZIP ( or PKUNZIP (

Extensions Connected with Compression Macs:.sit -- compressed; fine for AOL files.sit.hqx -- binhex; same as.hqx.hqx -- binhex; best for Internet.bin -- binary; smaller than.hqx, but you need a full-blown compression program to uncompress it compression program to uncompress it.sea -- “self-extracting archive;” will uncompress itself

Extensions Connected with Compression PCs:.zip -- “zipped” file or collection of files.exe -- “executable” program; these are often “self- extracting archives” that will uncompress extracting archives” that will uncompress themselves when you double-click or use the Run command.sea -- “self-extracting archive” that will uncompress itself; it may be a collection of files in the archive

Organizing Your Web Files Within the “http” folder in your Web files: create a folder entitled hrd490 or 390 create a folder entitled hrd490 or 390 create a 2nd folder entitled tryouts Withinthe hrd folder you will be constructing the Within the hrd folder you will be constructing the files for your web site. This will include: individual web pages all image, sound and other files that will be incorporated in the different pages

Organizing Your Web Files (cont.) hrd folder home. htm syllabus.htm lectures.htm links.htm image1.jpeg image2.gif sound1.wav

Organizing Your Web Files (cont.) Name the first web page that you want people to go to in your project : home.htm “Home” serves as a default setting -- when someone writes the address “hrd490” or “hrd390” they will be automatically connected to this page (home.htm) * Other default settings you may run into: index.htm index.htmindex.htmldefault.htm

Naming Your Web Files Use all lower case letters Use all lower case letters Use only letters or numbers -- no funny characters Use only letters or numbers -- no funny characters You can use ~ _ -. You can use ~ _ -. Never use a space Never use a space Web pages must end in.htm or.html Web pages must end in.htm or.html Put an extension (.jpeg,.gif,.tif) at the end of your Put an extension (.jpeg,.gif,.tif) at the end of your graphic file names graphic file names Keep the file name short Keep the file name short

Naming Your Web Files -- Other Tips Give each file a prefix that indicates Give each file a prefix that indicates what it is. what it is. Make sure that all files that belong on Make sure that all files that belong on one page start with the same letter. one page start with the same letter.