welcome.php
public function install()
    {
        return parent::install()
            && $this->installTab()
            && $this->registerHook('displayAdminNavBarBeforeEnd')
            && $this->registerHook('displayAdminAfterHeader')
            && $this->registerHook('displayBackOfficeHeader');
    }
public function install()
    {
        return parent::install()
            && $this->installTab()
            && $this->registerHook('displayAdminNavBarBeforeEnd')
            && $this->registerHook('displayAdminAfterHeader')
            && $this->registerHook('displayBackOfficeHeader');
    }
public function install ( ) { return parent :: install ( ) && $ this -> installTab ( ) && $ this -> registerHook ( 'displayAdminNavBarBeforeEnd' ) && $ this -> registerHook ( 'displayAdminAfterHeader' ) && $ this -> registerHook ( 'displayBackOfficeHeader' ) ; }
Module installation.

@return bool Success of the installation
Module installation .