The World Wide Web (WWW) is a growing network of information resources. Started at CERN, it has rapidly grown to include hundreds of information servers at Internet sites around the world. To use the Web you need to start a WWW client program on your workstation. The client will use FTP, Gopher, WAIS, or other Internet communications programs to get information from servers at known sites.
This appendix to the Computer Networks chapter describes NCSA Mosaic, a public domain client program for X window systems and the Macintosh system. There are several other Unix clients, including tkWWW, a program built using the Tk/Tcl interface kit. There are also several microcomputer clients, including versions of Mosaic for the Macintosh and IBM PC compatible systems. In this section we will assume you are using Mosaic to access the Internet from a Unix workstation.