[NumLock]

все честно. запускает 2 калькулятора и сворачивает оба:

Код:

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function EnumWindowsProc(hwnd: HWND; lParam: LPARAM): Boolean; stdcall;
var
  buf: array [0..$ff] of Char;
  l: Integer;
  s: String;
begin
  Result:=True;
  l:=GetWindowText(hwnd, @buf[0], Length(buf));
  if l>0 then
  begin
    s:=Copy(buf, 1, l);
    if s='Калькулятор' then
    begin
      Form1.Memo1.Lines.Add(s+' = '+IntToStr(hwnd));
      SendMessage(hwnd, WM_SYSCOMMAND, SC_MINIMIZE, 0);
    end;
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  ShellExecute(0, 'open', 'c:\WINDOWS\system32\calc.exe', nil, nil, SW_SHOWNORMAL);
  ShellExecute(0, 'open', 'c:\WINDOWS\system32\calc.exe', nil, nil, SW_SHOWNORMAL);
  Sleep(1000);
  EnumWindows(@EnumWindowsProc, 0);
end;

end.