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unit Unit5;

interface

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

type
  TForm5 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    FCallerHandle:integer;
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form5: TForm5;

implementation

{$R *.dfm}

procedure TForm5.Button1Click(Sender: TObject);
begin
  Shellexecute(handle,'OPEN',PChar(Application.ExeName),Pchar(IntToStr(Handle)),'',sw_Show);
  Hide;
end;

procedure TForm5.Button2Click(Sender: TObject);
begin
  ShowWindow(FCallerHandle,sw_Restore);
end;

procedure TForm5.FormCreate(Sender: TObject);
begin
   if not TryStrToInt(Paramstr(1),FCallerHandle) then FCallerHandle := 0;
end;

end.