I've got this perl/tk app that sits in the system tray (windows). When you lick on it small window opens and presents two options to the user via radio buttons. What I'm trying to do is get the small window to open when the user is logging out/restarting or rebooting. This way they can select one of the radio buttons. Here is the sample code I'm working with trying to catch a system event via wmi. What I'm having an issue with right now is identifying the class info to define the query. I think __Systemevents is the right area, but can't find helpful documentation. 
use Win32::OLE qw(EVENTS);
use Win32::Console;

my $console = Win32::Console->new(STD_INPUT_HANDLE);

my $refWMI = Win32::OLE->GetObject('winMgmts:');
my $refSink = Win32::OLE->new ('WBemScripting.SWbemSink');

Win32::OLE->WithEvents($refSink,\&eventCallback);

my $strQuery = "SELECT * FROM __SessionEndingEventHandler "
        . "WITHIN 10 WHERE TargetInstance ISA '\Win32_Service\'";
$refWMI->ExecNotificationQueryAsync($refSink, $StrQuery);

print "Waiting for Events ...\n";
my $continueLooping = 1;
while ($continueLooping) {
    if ($console->GetEvents()!= 0){
        my @cons = $console->Input();
        if ($cons[1] != 0){
            undef $countingLooping;
        }
    }
    Win32::OLE->SpinMessageLoop();
    Win32::Sleep(500);
    
    }
    $refSink->Cancel();
    Win32::OLE->WithEvents($refSink);
    undef $refSink;
    undef $refWMI;
    undef $console;
    print "Finished.\n";
    
    sub eventCallback()
    {
        my ($refSource,$refEventName,$refEvent,$refEvent,$refContext) 
+= @_;
        if ($refEventName eq "onObjectReady") {
            print $refEvent->TargetInstance->{Name}
                . " has "
                . ($refEvent->TargetInstance->{Started}
                ? "started" : "stopped")
                . "\n";
        }
    }

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In reply to Catching system events, via WMI by freebsdboy

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