This system has the advantage of being easy for a UNIX system administrator to set up, and it can provide a small amount of information quickly. CSO CSO is a computer resident phone book, or a sort of White Pages for the e-mail and telephone directory system used at many universities. What's important for us is that with a client program called PH, or with Gopher and from Web browsers, looking information up in these computerized White Pages is simple. List Servers Electronic mailing lists, commonly called list servers, are so common on the Internet that it's hard to think of them as a form of publishing, but they are. List servers are a means of distributing information to a controlled circulation list.
Some list servers are open and anyone can join and send messages.
Others are called moderated lists, and the moderator edits the contributions for what is appropriate and what is not. Finally, some list servers are one-way and consist entirely of announcements from a central source with no mechanism for sending replies or comments. People subscribe to such a list to get the most current information from that source. The three types of list servers are Open lists, which promote discussion between any and all subscribers of the mailing list, whether they know each other or not. Usually, subscribing to such a list means nothing more than sending a subscription request via e-mail.