What's the shortcut to show notifications bar on OS X?

Hey everyone,

I am a big fan of the shortcuts usage so I was wondering if anyone can tell me what's the shortcut to show the notifications bar on my macbook

Ezample: When you want to find something using spotlight you'll press: Comand + Space bar = Show spotlight search

To send something Shift + comand + D = Send Like Sending twitters or mails

Thanks a lot !!