A Web file with the suffix of ".shtml" (rather than the usual
".htm") indicates a file that includes some information that
will be added "on the fly" by the server before it is sent to
you. A typical use is to include a "Last modified" date at the
bottom of the page. This Hypertext Transfer Protocol facility is
referred to as a server-side include. (Although rarely done, the
server administrator can identify some other file name suffix
than ".shtml" as a server-side include file.) You can think of a
server-side include as a limited form of common gateway
interface application. In fact, the CGI is not used. The server
simply searches the server-side include file for CGI environment
variables, and inserts the variable information in the places in
the file where the "include" statements have been inserted. When
creating a Web site, a good idea is to ask your server
administrator which environment variables can be used and
whether the administrator can arrange to set the server up so
that these can be handled. Yo