Hmm... Well, derefrencing a hashref can be done in the way you showed up there, but it is perfectly valid to get a scalar back from a hashref this way as well:
$scalar = $$hashref{key};
and assigning into a hashref can be done in the same way:
my $hashref = {};
$$hashref{key} = $scalar;
Perhaps taking a look at
References quick reference will sum it up nicely.
Thanks,
Scott
Project coordinator of the Generic Model Organism Database Project
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