| Browser is a user interface program for navigating and viewing Hypermedia. the Mailcap file determines which viewer may be used. There may also be interaction with other (Server) programs via the CGI. |
| The Internet transmits MIME (MultiPurpose Internet Mail Exchange) data from the server. The Server responds to URL sent with HTTP by the Browser. If the MIME data is not HTML, the Browser may invoke a separate viewer. |
| The Server is a program which responds to requests from Browsers for hypermedia. The URL supplied by the Browser determines if response is an HTML file or is to be generated by a CGI program. |