como capturar informacao sobre proxy ( delphi )

no IE:

uses registry;

function rtncapturar_endereco_proxy_IE() : string;
begin
  with TRegistry.Create do
    try
        RootKey := HKEY_CURRENT_USER;
        if OpenKey('\Software\Microsoft\Windows\CurrentVersion\Internet Settings', False) then begin
          Result := ReadString('ProxyServer');
          CloseKey;
        end
        else
          Result := '';
    finally
      Free;
    end;
end;