Как производить Печать из WebBrowsera

var
  vaIn, vaOut: OleVariant;
...
WebBrowser.ControlInterface.ExecWB(OLECMDID_PRINT,
OLECMDEXECOPT_DONTPROMPTUSER, vaIn, vaOut);

procedure TForm1.PrintIE;
var
  CmdTarget : IOleCommandTarget;
  vaIn, vaOut: OleVariant;
begin
  if WebBrowser1.Document <> nil then
    try
      WebBrowser1.Document.QueryInterface(IOleCommandTarget, CmdTarget);
      if CmdTarget <> nil then
        try
          CmdTarget.Exec( PGuid(nil), OLECMDID_PRINT, 
                         OLECMDEXECOPT_DONTPROMPTUSER, vaIn, vaOut);
        finally
          CmdTarget._Release;
        end;
    except
      // nothing
    end;
end;

PGuid(nil)

PGuid(nil)^