unit Unit1;

Interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
    StdCtrls;

type
  TForm1 = class (TForm)
    Button1 : TButton;
    procedure FormDestroy (Sender: TObject);
    procedure FormCreate (Sender: TObject);
  private
    { private declarations }
  public
    { public declarations }
  end;

var
  Form1 : TForm1;

implementation

{$R *.DFM}

const
  RSPSIMPLESERVICE     = 1;
  RSPUNREGISTERSERVICE = 0;

function RegisterServiceProcess (dwProcessID, dwType: DWord) : DWord; 
  stdcall; external 'KERNEL32.DLL'; 

procedure TForm1.FormDestroy (Sender: TObject); 
begin 
  RegisterServiceProcess (GetCurrentProcessID, RSPUNREGISTERSERVICE)
end; 


procedure TForm1.FormCreate (Sender: TObject); 
begin 
  RegisterServiceProcess (GetCurrentProcessID, RSPSIMPLESERVICE)
end; 


end.