Sometimes there is need to display categories of store other than running store in Magento.
Below code will achieve it to get categories of store other than running store.
getStore($storeId)->getRootCategoryId();
$category_model = Mage::getModel('catalog/category');
$_category = $category_model->load($root_cat); // category id for which the child categories to be found
$all_child_categories = $category_model->getResource()->getAllChildren($_category); //array consisting of all child categories id
echo '';
print_r($all_child_categories);
echo '
';
?>
