While running tests with compiled CGI executables, I couldn't get text in the browser screen in a reliable way. So I had to revert to:

written documentation
a 'Hello world' style program

and the result is what you see below (and can rertrieve from the download section). This program is plain simple, but it is also very important. It shows that if you need to output n lines to the screen, you need to send n+2 lines!

      
MODULE access;

FROM  InOut   IMPORT  WriteString, WriteLn;

BEGIN
   WriteString ("Content-Type : text/plain");
   WriteLn;
   WriteLn;
   WriteString ("Hi there, this is my text.");
   WriteLn
END access.

If you want to see what it does, just run this file
by clicking the underlined section. ;o)

Below is part of the HTML source to enable you to see these magnificant words on screen.

   <h1 class="center">
    If you want to see what it does, just
    <a href="http://verhoeven272.nl/cgi-bin/access" target="_blank">
    run this file
    </a>
    <br>
    by clicking the underlined section. ;o)
   </h1>

I did some tests with the invoking mechanism. This is a very picky mechanism. It needs to know several things. This example is based on a CGI executable that resides on a remote webserver.

The protocol. In this case 'http://'
The server on which the executable is. In this case 'verhoeven272.nl'
The CGI path: '/cgi-bin/'
The name of the executable: 'access'

Combine this all and you get the full URL for the CGI program: http://hydrogen/cgi-bin/access. This is the address you can use within your LAN as long as hydrogen is running and the alias is known in '/etc/hosts'.
Another method would be to use http://127.0.0.1/cgi-bin/access as the fully qualified URL. '127.0.0.1' is short for 'This machine'. Or, shorter still: '/cgi-bin/access' would to the trick as well...

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