HTTP daemon

We use the Hypertext Transport Protocol Daemon (HTTPD) from the National Center for Supercomputer Applications, NCSA. This software is intended to

Serve HTML pages, including graphics, and other static information to users on the World-Wide Web.
Start programs on the server machine, using what's called the Common Gateway Interface (CGI), which can take information from the request and construct pages or graphic information to be sent back to the user. This ability is used by our data server.

You can get more information about HTTPD from NCSA`s httpd overview .