in reply to
Passing variable to another CGI.pm program
It has been a while since I've done that but I think when you put the "multiple" option on a select box, you will receive an array of values on the other side. Try a print Dumper of the CGI params and you should be able to find the selected value(s).
I think you would be able to do this:
my @names = $cgi->param('name_of_select_box');
If $cgi is a CGI object. But try the Dumper first to make sure.
Testing never proves the absence of faults, it only shows their presence.