program Project1;

uses
  Vcl.Forms,
  Unit1 in 'Unit1.pas' {Form1};

{$R *.res}
var
  Form1: TForm1;
  Form2: TForm1;
  Form3: TForm1;
begin
  Application.Initialize;
  Application.MainFormOnTaskbar := True;
  Form2 := TForm1.Create(nil);
  Form3 := TForm1.Create(nil);
  Application.CreateForm(TForm1, Form1);
  Form2.Show;
  Form3.Show;
  Application.Run;
end.


unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    FButtonClicked : Integer;
  public
    property ButtonClicked : Integer read FButtonClicked;
  end;

//var
//  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  inc(FButtonClicked);
end;

end.