I currently use four different operating systems throughout my personal and business life: Microsoft Windows 10, Linux Mint, Raspberry Pi, and Apple OS 10.x.  
One interesting keyboard shortcut I like to use is the Windows start button.  I just tap the windows key and the menu pops up.  Today I noticed tapping the Windows key on my Linux Mint and my Raspberry Pi computers keyboards yields the same result – the start menu appears.
 
					