Citrix Receiver Mac - How To Change From Fullscreen To Window

Spent a frustrating few minutes trying to figure out how to exit Full Screen mode on Citrix Receiver with no menu and no idea what the shortcut key on the Mac was to get to the menu. Then hit my friend Google for advice. Came across a post which helped my out on the Citrix Discussion board

"ctrl + alt on the Mac keyboard was what I am looking for. It brings up the menu bar and the dock and lets you get out of the fullscreen mode."

Thanks to Matthias Hofmann for that answer!