I'm going to agree with the:

foreach my $i (keys %in){
    print "$i: $in{$i}\n";
}
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idea. That seems to be the best way, and it wouldnt be too hard to -use- the data either. If you're sending out an e-mail, just spit the key - value pairs out to wherever you need them. You could do something with a large case statement, but that depends on the app.

Using a hidden field is nice, but it still doesnt get you the names of each of the keys. For that you still have to call keys %n, and you might as well just use the foreach loop.

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