Internet Services  
     (the most popular ones) 
-  E-mail:   message from one sender to one or more recipients
  
-  Mailing List:   group discussion carried out
                    with E-mail; every message
                    goes to all.
-  USENET:        Every "news posting" is
                   readable world-wide.
-  Log-in:         Many libraries and other
                    services require no password. 
-  File servers:    Provide file libraries. Include:
                              FTP, gopher, WWW.
Not covered:
   IRC (Internet Relay Chat - "CB")  
   WAIS (Library searches - still only in limited academic use)