[RJF]

unit Unit1;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, IDStack, StdCtrls, Buttons, OleCtrls, SHDocVw, ActiveX, WinInet, Winsock;
type
  TForm1 = class(TForm)
    WebB: TWebBrowser;
    TxtDireccion: TEdit;
    Memo1: TMemo;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    BitBtn2: TBitBtn;
    Button1: TButton;
    Edit1: TEdit;
    procedure BitBtn1Click(Sender: TObject);
    procedure WebBDocumentComplete(Sender: TObject; const pDisp: IDispatch;
      var URL: OleVariant);
    procedure BitBtn2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
    function WebBrowerDocumentSource(webBrowser: TWebBrowser) : string;
  end;
var
  Form1: TForm1;
implementation

les dejo la cabecera del proyecto para que vean las unidades utilizadas, realizado en Delphi 7