How do I append a unique menu ID to the menu? I'm using Drupal 7 and I want to append a unique ID to specific menus. My search result gives me the way to change the item of the menu, but I want to change the menu itself. 
Is there a way to do that?
You can use the menu attributes module to add custom classes, id's, names etc... to any menu item in Drupal. Very handy module when you are looking to alter Drupal's menu system to create a custom look.