Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

uses
  MSHTML_TLB, SHDocVw_TLB;

 procedure TForm1.Button1Click(Sender: TObject);
 var
  ShellWindow: IShellWindows;
  WB: IWebbrowser2;
  spDisp: IDispatch;
  IDoc1: IHTMLDocument2;
  k: Integer;
 begin
  ShellWindow := CoShellWindows.Create;
  for k := 0 to ShellWindow.Count do
  begin
    spDisp := ShellWindow.Item(k);
    if spDisp = nil then Continue;
    spDisp.QueryInterface(iWebBrowser2, WB);
    if WB <> nil then
    begin
      WB.Document.QueryInterface(IHTMLDocument2, iDoc1);
      if iDoc1 <> nil then
      begin
        WB := ShellWindow.Item(k) as IWebbrowser2;
        WB.Refresh;
      end;
    end;
  end;
 end;