procedure TForm1.Button3Click(Sender: TObject);
var
  si: STARTUPINFO;
  pi: PROCESS_INFORMATION;
  cmdline: string;
begin
  ZeroMemory(@si,sizeof(si));
  si.cb:=SizeOf(si);
  cmdline:='c:\command.com';
  if not CreateProcess( nil, { No module name (use command line). }
  PChar(cmdline),            { Command line. }
  nil,                       { Process handle not inheritable. }
  nil,                       { Thread handle not inheritable. }
  False,                     { Set handle inheritance to FALSE. }
  0,                         { No creation flags. }
  nil,                       { Use parent's environment block. }
  nil,                       { Use parent's starting directory. }
  si,                        { Pointer to STARTUPINFO structure. }
  pi )                       { Pointer to PROCESS_INFORMATION structure. }
  then
  begin
  ShowMessage( 'CreateProcess failed.' );
  Exit;
  end;
  WaitForSingleObject( pi.hProcess, INFINITE );
  CloseHandle( pi.hProcess );
  CloseHandle( pi.hThread );
  ShowMessage('Done !');
end;