To answer your bonus question, according to the CGI docs, $fh1 and $fh2 are not only file handles but also the entered file names.

In reply to Re: CGI.pm debugging with TYPE=FILE & ENCTYPE="multipart/form-data" by pc88mxer
in thread CGI.pm debugging with TYPE=FILE & ENCTYPE="multipart/form-data" by jae_63

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