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Server Side Includes (SSI) are tags embedded directly into an HTML file that perform special functions. They are most commonly used for running CGI scripts and displaying the result; most web page counters are performed using SSI.
If you use mod_perl with mod_include (another Apache server module), you can embed Perl subroutines into SSI directives. For example:
<!--#perl sub="sub {print ++Count}" -->The Apache::Include module lets you include entire Apache::Registry scripts:
<!--#perl sub="Apache::Include" arg="/perl-bin/counter.pl" -->
You could have used standard SSI to include a CGI script for the same purpose, but this way is faster. To use mod_include with mod_perl, you need to configure mod_perl to do so at compile-time.
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| 15.4. Running CGI Scripts with mod_perl |  | 15.6. <Perl> Sections |
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