This is a good thing to add in your FrontController.php if for example you have 2 different shops with different themes, and you want to access a few multistore smarty variables
In /classes/controller/FrontController.php find inside public function init() { and add:
// Super Assign Multi Store
$this->context->smarty->assign(array(
'ms_id' => $this->context->shop->id, // Shop ID
'ms_name' => $this->context->shop->name, // Shop Name
'ms_status' => $this->context->shop->active, // Shop Status
'ms_theme' => array(
'id' => $this->context->shop->id_theme, // Shop Theme ID
'name' => $this->context->shop->theme_name, // Shop Theme Name