CGI is "generally" (but not always) on-topic because CGI scripts are "generally" (but not always) written in Perl.

If you were writing a CGI script in C and came here for help, that would be considered off-topic (although you'd probably still get some useful answers).

Pure HTML/MySQL/Apache questions are considered off-topic, but those that involve Perl are not.

Bottom line is: use a bit of common sense. If your question involves the use of Perl in some way, then it's (probably) on-topic. It's not _that_ difficult to figure out.

Cheers,
Darren :)