Thanks for the reply, David.  I had considered running it as a service, but I 
think the apps may be a little too complex to be simple services - I don't know 
all that much about creating service applications.

Meanwhile, I continued to look for a solution and found that if I override 
WndProc and call the UDP component's Destroy method in this procedure I am able 
to log off:

procedure TForm1.WndProc(var Msg: TMessage);
begin
 inherited WndProc(Msg);
 if Msg.msg = WM_QUERYENDSESSION then
  begin
   //Msg.Result:= 1;
   //showmessage('End session');
   NMUDP1.Destroy;
   //Close;
  end;
end;

The commented-out lines represent my previous forlorn efforts.

Anyone see inherent dangers here?

Regards

Steve



-----Original Message-----
From: [email protected] [mailto:[EMAIL PROTECTED]
Behalf Of David Smith
Sent: 28 October 2008 15:15
To: [email protected]
Subject: Re: [delphi-en] Can't log off when UDP app is running


is it running in a background thread? Maybe you should reconfigure it to run as 
a service


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