Sorry, here is the code from the helper file on that rule:
case "loggedin":
$comparisons[0] = array(TRUE, "".((isset($_SESSION['CustomerID']))?$_SESSION['CustomerID']:"") ."", 5, "1");
$comparisons[1] = array(TRUE, "".((isset($_SESSION['level']))?$_SESSION['level']:"") ."", 5, "2");