If you enable SSI in Apache (assuming you use Apache) you can include an executable program using include virtual:

<!--#include virtual="/cgi-bin/myscript.cgi" -->
[download]

You will have to load mod_include, turn on "Option Includes" in the relevant directory and add/edit in httpd.conf:

AddType text/html .shtml
AddOutputFilter INCLUDES .shtml
[download]

I think that's about it but see http://httpd.apache.org/docs-2.0/howto/ssi.html for a more complete tutorial.