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procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
   Action := caNone;
end;					

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ExitWindowEx(EWX_POWEROFF);					

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unit pw;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button3: TButton;
    Edit2: TEdit;
    Label2: TLabel;
    Button2: TButton;
    procedure Button3Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button3Click(Sender: TObject);
begin
  IF edit2.Text = ('passwort')
  then close;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
close;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin

end;

end.