SSI - server side includes

Server-Side Includes (SSI) are small commands that you can put in your html document. These commands perform specific functions, such as inserting text, date, server variables, etc., thus making your html content more dynamic. On HOSTEX you can put these pages under /www or /secure directories. Files should have .shtml extensions. File permissions do not differ from the standard html pages: -rw-r--r-- (644), but if you want to execute any programs from these pages with exec directive, permissions should not be less than: -rwxr-xr-x (755).

More information about ssi can be found at http://www.apache.org/docs/mod/mod_include.html and http://hoohoo.ncsa.uiuc.edu/docs/tutorials/includes.html.