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type
  TForm2 = class(TForm)
  private
    bCaller  : Tcomponent;
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
    constructor Create(AOwner, Caller: TComponent); Overload;
  end;
 
  ....
 
implementation
  ....
constructor TForm2.Create(AOwner, Caller: TComponent);
begin
   Create(AOwner);
   bCaller := Caller;
end;