Delphi method is prohibited rerun program

The first method, using a "procedure call"

Procedure Del; // custom procedure 
var 
  the Mutex: THandle; 
the begin 
  the Mutex: = the CreateMutex ( nil , True, the PChar (Application.Title));
   IF the GetLastError = ERROR_ALREADY_EXISTS the then 
  the begin 
    Application.MessageBox ( '! repeat login', 'prompted ' , MB_ICONERROR); 
    the ReleaseMutex (the Mutex);    { release resources } 
    Application.Terminate; 
  End ;
 End ;

The second way: by writing dpr project file

program Project1;
uses
  Forms, windows,
  Unit1 in 'Unit1.pas' {Form1};
{$R *.RES}
var Mutex:THandle;
begin
 Mutex := CreateMutex(nil,true,'one');  {第3个参数任意设置}
 if GetLastError <> ERROR_ALREADY_EXISTS then
 begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
 end
 else
  Application.MessageBox('Repeat login! ' , ' Prompted ' , MB_OK); 
  the ReleaseMutex (the Mutex);    { release resources } 
End .