(SSI) The facility provided by most {web servers}, e.g. {NCSA httpd}, to replace special {tag}s in an HTML file with the contents of another file before the file is sent out by the server, i.e. an HTMLmacro. {NCSA httpd tutorial (http://hoohoo.ncsa.uiuc.edu/docs/tutorials/includes.html)}. (1996-09-08)