# reference the parameter directly. Prints Jane's number
    print "ref1 = ", $config->{jane}->{tel_no}, "\n";

##</code><code>##

    # construct the same symbolic reference locally
    # just to make sure. Still yields nothing!
    $parm_str = "\$" . "config->{jane}->{tel_no}, "\n";
    print "ref3 = ", $$parm_str, "\n";

##</code><code>##

    $parm_str = "\$" . $config->{jane}->{tel_no};

##</code><code>##

    $parm_str = \$config->{jane}->{tel_no};

##</code><code>##

    $parm_str = '$config->{jane}->{tel_no}';

##</code><code>##

    print "value = ", eval($parm_str), "\n";