If I'm not misinformed, inside the ActivePerl directory there are three directories for modules:
- The directory containing the modules that corelist knows about
- The modules that were installed post-installation by means of cpan, ppm, or whatver
- The non-core modules that were by default installed by your Perl distribution
At least it works that way for my Strawberry installation, and I seem to remember it was the same for ActivePerl. I am sure I remember that ActivePerl at least had those directories, and I assume they're used the same way.