Model

getAutoInstance

<?php
$productTable = RModel::getAutoInstance('Configuration');

will get an instance of the backend or frontend model RedshopModelConfiguration if the option is com_redshop.

getAdminInstance

<?php
$productTable = RModel::getAdminInstance('Configuration');

will get an instance of the backend model RedshopModelConfiguration if the option is com_redshop.

getFrontInstance

<?php
$productTable = RModel::getFrontInstance('Configuration');

will get an instance of the frontend model RedshopModelConfiguration if the option is com_redshop.