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  1. or download this
    # store a reference to the hash
# note the backslash!
$session->param("access", \%access);
  2. or download this
    #retrieve the reference to the hash
my $access_ref = $session->param("access");
  3. or download this
    # access the data in the hash reference
print "My data from the hash is: ", $access_ref->{hashkey}, "\n";