(最好有实例)子窗口怎么更改父窗口的某Label?

Question

目标:
A窗口里有1个Label.
第一步:在A窗口单击某按钮,弹出B窗口;
第二步:在B窗口单击某按钮,A窗口的Label的Caption变为'123'.
哪位有空可贴实例,没空的写写具体做法,我菜+笨,写"用第三个窗口中转下"之类的我不懂D..

Answer 1

implementation
 uses unit2;
{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
begin
 form2.Show;
end;
[code=Delphi(Pascal)]unit Unit2;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs,unit1, StdCtrls;type
  TForm2 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form2: TForm2;implementation{$R *.dfm}procedure TForm2.Button1Click(Sender: TObject);
begin
  form1.Button1.Caption:='124';
end;end.
[/code]