A server-side include is a variable value (for example,
a file "Last modified" date) that a server can include in an
HTML file before it sends it to the requestor. If you're creating a Web
page, you can insert an include statement in the HTML file that looks
like this:
<!--#echo var="LAST_MODIFIED"-->
and the server will obtain the last-modified date for the file and insert
it before the HTML file is sent to requestors.
LAST_MODIFIED is one of several environment variables that an operating
system can keep track of and that can be accessible to a server program.
The server administrator can make these environment variables usable when
the system is set up.
A Web file that contains server-side include statements (such as the
"echo" statement above) is usually defined by the administrator
to be a file with an "." suffix. 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.
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