In this chapter we shall go into some detail on the configuration of a few of the most popular World Wide Web servers - NCSA's HTTPD, CERN's HTTPD and MacHTTP. As new releases of these servers become available, this information given here will become incomplete, but server writers attempt to maintain compatibility with previous versions. You should use this chapter as a guide as to the functionality available, but also check the latest online data when installing a server. A list of relevant URLs is given in appendix .