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13     World Wide Web
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Introduction to the World Wide Web                                              
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What is it?                                                                     
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  - distributed information system developed at CERN                            
                                                                                
                                                                                
Paradigm                                                                        
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   - hypertext                                                                  
                                                                                
   - based on URL (universal resource locator)                                  
                                                                                
      http://milkman.cac.psu.edu/~kalbach/hotlist.html                          
                                                                                
       - specifies access type and location of html document                    
                                                                                
   - html: hyper text markup language                                           
                                                                                
                                                                                
client/server                                                                   
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   - user runs WWW client                                                       
                                                                                
        (lynx, mosaic, macWeb, cello)                                           
                                                                                
       - text-only versus multimedia clients                                    
                                                                                
       - clients use 'helper' applications to deal with different               
              data types (pictures, animations, sounds, etc.)                   
            
   - NETSCAPE is recommended client  
                                                                    
                                                                                
hotlist                                                                         
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   - similar to gopher bookmark                                                 
                                   
     - may have to cut & paste URL's into PFE file to
        have own bookmark list                                             
                              
                                                  
finding stuff                                                                   
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     - NETSCAPE DIRECTORY button goes to different directories   

     - NETSCAPE SEARCH button gets you to different search
      engines                                         
                                                                                
                                                                                
simple tour of the WEB                                                          
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    - penn state stuff                                                          
                                                                                
    - mosaic home page                                                          
                                                                                
    - cool stuff                                                          
                
    - finding peoples email addresses
                                                                
    - 283 library disk                                                          
                                                                                
        http://milkman.cac.psu.edu/~santoro/283.html