I am running Windows 7 on a virtual image using virtualbox on my max osx. I need to know what the windows key is on the mac keyboard. Any tips?
By default it's the right ⌘ (Command) Key.
The left ⌘ (Command) Key does not work because it is set as the Host (Meta) Key in VirtualBox.
And they can be swapped simply by replacing the Host Key with the right ⌘ (Command) Key, in Preferences > Input > Virtual Machine > Host Key Combination.
On Virtualbox 4.3.6, I use Ctrl + Esc for the Windows button.
Tested on Windows 7 and 8.1
By default the Windows key is mapped to the Command key on an Apple keyboard.
On the Windows 7 Desktop, tap the Command key and see if the Start menu appears.
You can change the mapping of keys in VirtualBox if you don't like the default mapping as well.