The Server Side Includes (SSI) scripting language triggers further processing on your static web pages. The server parses an HTML page looking for SSI directives. It then processes those directives and creates a new page that in turn is passed back to the user. The modification directives that SSI supplies can do simple text replacement or can call programs to supply the text. The range of possibilities is endless for SSI, and you will see an example of each SSI directive in this chapter.