[This is preliminary documentation and subject to change]
You can configure the Web server to automatically insert an HTML-formatted file to the bottom of every Web page sent out by your Web server (appending footers to ASP pages is not supported). For example, your file can contain HTML formatting instructions to add a simple text message and logo image to your Web pages. For more information, see About Web Site Management and Server-Side Includes.
Note
Document footers can reduce Web server performance,
especially if a Web page is frequently accessed.
Note
The footer file should be not be a complete HTML
document. It should contain only those HTML tags necessary for
formatting the appearance of footer content. For example, a footer
file that adds your organization's name to the bottom of every Web
page should consist of text and the HTML tags necessary for
formatting the text's font and color.