Hi,
I think you can do this by using Win32::PerfLib - or perhaps the Win32::Process::Info module can also provide what you need.

I have a rather lengthy demo script that uses Win32::PerfLib to (supposedly) print out the same info as provided by Task Manager. It doesn't work properly (in that it fails to provide all of the info it is supposed to), but it does produce a list of all of the running processes, along with their respective PIDs. So you should be able to adapt it to meet your needs. I'm using Windows 2000 and perl 5.8.8. Hopefully it works well enough for you, too:

#!perl -w

# ====================================================================
+==
#   $Author: Jmk $
#   $Date: 19.05.98 7:12 $
#   $Archive: /Jmk/scripts/saa/process.pl $
#   $Revision: 2 $
# ====================================================================
+==

# shows the task list like the task manager but of any computer

use Win32::PerfLib;
$server = "";
Win32::PerfLib::GetCounterNames($server, \%counter);
%r_counter = map { $counter{$_} => $_ } keys %counter;

#foreach $key(keys %counter) {
#print "$key: $counter{$key}\n";
#}
#__END__
$process_obj = $r_counter{Process};
$process_id = $r_counter{'ID Process'};
$processor_time = $r_counter{'% Processor Time'};

#$process_obj = 230;
#$process_id = 784;
#$processor_time = 6;
#$elapsed = 684;
#$memory = 180;
#$page_faults = 28;
#$virtual_memory = 186;
#$priority = 682;
#$threads = 680;

$perflib = new Win32::PerfLib($server);
$proc_ref0 = {};
$proc_ref1 = {};
$perflib->GetObjectList($process_obj, $proc_ref0);
sleep 5;
$perflib->GetObjectList($process_obj, $proc_ref1);
$perflib->Close();
$instance_ref0 = $proc_ref0->{Objects}->{$process_obj}->{Instances};
$instance_ref1 = $proc_ref1->{Objects}->{$process_obj}->{Instances};
foreach $p (keys %{$instance_ref0})
{
     $counter_ref0 = $instance_ref0->{$p}->{Counters};
    $counter_ref1 = $instance_ref1->{$p}->{Counters};
    foreach $i (keys %{$counter_ref0})
    {
        next if $instance_ref0->{$p}->{Name} eq "_Total";
        if($counter_ref0->{$i}->{CounterNameTitleIndex} == $process_id
+)
        {
            $process{$counter_ref0->{$i}->{Counter}} =
              $instance_ref0->{$p}->{Name};
            $id{$counter_ref0->{$i}->{Counter}} = $p;
        }
        elsif($counter_ref0->{$i}->{CounterNameTitleIndex} == $process
+or_time)
        {
            $Numerator0 = $counter_ref0->{$i}->{Counter};
            $Denominator0 = $proc_ref0->{PerfTime100nSec};
            $Numerator1 = $counter_ref1->{$i}->{Counter};
            $Denominator1 = $proc_ref1->{PerfTime100nSec};
            $proc_time{$p} = ($Numerator1 - $Numerator0) /
              ($Denominator1 - $Denominator0 ) * 100;
            $cputime{$p} = int($counter_ref1->{$i}->{Counter} / 100000
+00);
        }
        elsif($counter_ref0->{$i}->{CounterNameTitleIndex} == $memory)
        {
            $memory{$p} = int($counter_ref0->{$i}->{Counter} / 1024);
        }
        elsif($counter_ref0->{$i}->{CounterNameTitleIndex} == $page_fa
+ults)
        {
            $page_faults{$p} = $counter_ref1->{$i}->{Counter};
        }
        elsif($counter_ref0->{$i}->{CounterNameTitleIndex} == $virtual
+_memory)
        {
            $virtual_memory{$p} = int($counter_ref0->{$i}->{Counter} /
+ 1024);
        }
        elsif($counter_ref0->{$i}->{CounterNameTitleIndex} == $priorit
+y)
        {
            $priority{$p} = $counter_ref0->{$i}->{Counter};
        }
        elsif($counter_ref0->{$i}->{CounterNameTitleIndex} == $threads
+)
        {
            $threads{$p} = $counter_ref0->{$i}->{Counter};
        }
    }
}
print " PID Process         CPU   CPU-Time     Memory       PF   Virt.
+Mem Priority Thr\n";
#   0 Idle          93.73   20:51:40       16 K        1        0 K Un
+known    1
foreach $p (sort { $a <=> $b } keys %process)
{
    $id = $id{$p};
    $seconds = $cputime{$id};
    $hour = int($seconds / 3600);
    $seconds -= $hour * 3600;
    $minute = int($seconds / 60);
    $seconds -= $minute * 60;
    if ($priority{$id} > 15)
    {
        $prio = "Realtime";
    }
    elsif ($priority{$id} > 10 )
    {
        $prio = "High";
    }
    elsif ($priority{$id} > 5 )
    {
        $prio = "Normal";
    }
    elsif ($priority{$id} > 0 )
    {
        $prio = "Low";
    }
    else
    {
        $prio = "Unknown";
    }
    printf("% 4d %-14s%5.2f  % 3d:%02d:%02d % 8d K % 8d % 8d K %8s % 3
+d\n",
           $p, $process{$p}, $proc_time{$id}, $hour, $minute, $seconds
+,
           $memory{$id}, $page_faults{$id}, $virtual_memory{$id},
           $prio, $threads{$id});
}
[download]

Cheers,
Rob