unit Unit1;    interface    uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;    type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;    var
  Form1: TForm1;    implementation    {$R *.DFM}
Function ApplicationUse(fName : string ) : boolean;
var
  HFileRes : HFILE;
begin
  Result := false;
  if not FileExists(fName) then exit;
  HFileRes := CreateFile(pchar(fName), GENERIC_READ or GENERIC_WRITE,0, nil,
     OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL, 0);
  Result := (HFileRes = INVALID_HANDLE_VALUE);
  if not Result then CloseHandle(HFileRes);
end;    procedure TForm1.Button1Click(Sender: TObject);
begin
  if ApplicationUse('project2.exe') then showmessage('project2.exe is running');
end;    end.