Well, I carefully worded it "all-caps words with a special meaning". BEGIN isn't a reserved word. However, you can use reserved words as file handles, as long as you quote them when appropriate:

#!/usr/bin/perl

use strict;
use warnings;

open print => "/etc/passwd" or die;
print while <print>;

__END__
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If you replace the => with a comma, the code above won't compile.

Abigail