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type
  TForm1 = class(TForm)
    ...
    private
      procedure Start(var msg: TMessage); messsage MyMessageID;
    end;					

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type TMsgTimer=class(TWinControl)
 private
   Time: Integer;
   TimerPic: TAdvImage;
   TimerLbl: TLabel;
   procedure StartTimer(var msg: TMessage); message WM_STARTTIMER;
   procedure StopTimer(var msg: TMessage); message WM_STOPTIMER;
end;

...

 SendMessage(MsgTimer.Handle,WM_USER+1,0,0); //hier hätte ich gerne Application.Handle, dann gehts aber nichtmehr :(					

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 SendMessage(FindWindow('MsgTimer','Nynx'),WM_USER+1,0,0); //"msgTimer"= Klasse mit den proceduren ; "Nynx"=Name der Application					

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 SendMessage(FindWindow('TMsgTimer','MsgTimer'),WM_USER+1,0,0);					

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unit UClock;

interface

uses ...

const WM_STARTTIMER=WM_USER+1;
const WM_STOPTIMER=WM_USER+2;

implementation

uses Nynx2; {MainUnit}


type TMsgTimer=class(TWinControl)
 public
   procedure StartTimer(var msg: TMessage); message WM_STARTTIMER;
   procedure StopTimer(var msg: TMessage); message WM_STOPTIMER;
 private
   ...
end;

...					

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procedure TMsgTimer.StartTimer(var msg: TMessage);
begin
 ...
end;

procedure TMsgTimer.StopTimer;
begin
 ...
end;					

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procedure TMainForm.FormMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
var ...  H: THandle;
begin
...
   // H:=FindWindowEx(Application.Handle,0,'TMsgTimer',nil); 
   // H:=FindWindowEx(Application.Handle,0,'MsgTimer',nil); 
   // H:=FindWindow('TMsgTimer',PChar(MainForm.Caption));
   // H:=FindWindow('TMsgTimer',PChar(Application.Title));  //geht alles nicht
   SendMessage(H,WM_USER+1,0,0);
end;					

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure FormClick(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

  type
    TMyClass = class(TWinControl)
      private

      public
        procedure MyMsg(var Msg: TMessage); message WM_USer+1;
    end;

var
  Form1: TForm1;
  test: TMyClass;

implementation

{$R *.dfm}

procedure TForm1.FormClick(Sender: TObject);
var
  h: HWND;
begin
  h:=FindWindow('TForm1', nil);
  h:=FindWindowEx(h, 0, 'TMyClass', '');
  Form1.Caption:=IntToStr(h)+' '+IntToStr(test.Handle);
  SendMessage(h, WM_User+1, 0, 0);
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  test.Free;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  test:=TMyClass.Create(Self);
  test.Parent:=Form1;
end;

procedure TMyClass.MyMsg(var Msg: TMessage);
begin
  ShowMessage('sd');
end;

end.