At times, signing on to multiple websites individually becomes hectic and time consuming process. Single Sign On authentication has overcome this problems and offers simple and less time consuming process. In Drupal, for single sign on or sso, you don't need to add any extra module. No extra configuration is needed. While Drupal development of your websites, you just need to make few changes in settings.php and you are done.
Views Bulk Operations (VBO) module in Drupal development allows developers to add 'bulk operation' option in views. With this bulk operation option, users can select multiple items and perform actions on them, such as 'delete item', 'publish content' and 'unpublish content'.