Yes, you would do well to consider davorg's remarks.

SSI can call CGI scripts, that should be in the SSI documentation. There is also CGI::SSI which allows you to use SSI form within a CGI script, I have never used it.

If you are seriously writing CGI based applications then I believe you would be better off keeping things within the CGI rather than using a mixture. If you can do it in SSI then you can do it much more flexibly in CGI.

jdtoronto