多个exe的delphi工程问题(100分)

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

  TRunThread = class(TThread)
  private
    FMainForm: TForm1;
    FFileName: String;
  public
    constructor Create(MainForm: TForm1; FileName: String); overload;
    procedure Execute; override;
    end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

constructor TRunThread.Create(MainForm: TForm1; FileName: String);
begin
  inherited Create(False);

  FFileName := FileName;
  FMainForm := MainForm;
  FreeOnTerminate := True;
end;

procedure TRunThread.Execute;
var
  StartUpInfo: TStartUpInfo;
  ProcessInfo: TProcessInformation;
  ExitCode: LongWord;
begin
  FillChar(StartUpInfo, SizeOf(StartUpInfo), 0);
  StartUpInfo.cb := SizeOf(StartUpInfo);
  if (CreateProcess(PChar(FFileName), nil, nil, nil, FALSE, 0, nil, nil, StartUpInfo, ProcessInfo)) then
    begin
    try
      CloseHandle(ProcessInfo.hThread);
      WaitForSingleObject(ProcessInfo.hProcess, INFINITE);
      FMainForm.Enabled := True;
    finally
      CloseHandle(ProcessInfo.hProcess);
      end
    end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  T: TRunThread;
begin
  T := TRunThread.Create(Self, 'c:/winnt/notepad.exe');
  Enabled := False;
end;

end.