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[httpd.apache.org...]
If all you have to do is start using it on your pages, here are the basics you'll need
[httpd.apache.org...]
For example to include a footer on all pages
<!--#include virtual="/footer.html" -->
If you'll be starting to use it on existing pages with an .htm or .html file extension and don't want to have to change filenames, you'll have to put something in .htaccess so those pages can use ssi because generally it's .shtml