Some coding critique (not knowing anything about Tk):

$hlist->header('create', 0, -text => 'user');
$hlist->header('create', 1, -text => 'gid');
$hlist->header('create', 2, -text => 'pid');
$hlist->header('create', 3, -text => 'machine');
$hlist->header('create', 4, -text => 'service');
$hlist->header('create', 5, -text => 'ip-adres');
$hlist->header('create', 6, -text => 'logon time');
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I would code this as:

my $option = 0;
foreach (qw(user gid pid machine service ip-adres logon)) {
    $hlist->header('create', $option++, -text => $_);
}
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because I hate to repeat things myself that can be repeated by the computer. And I would try to do something similar for the rest of the snippet. And yes, I cheated a little by changing "logon time" to "logon" to make it work with qw(). ;-)

Liz