unlock cursor from current screen on Mac

[simusop 0]

Hi, I am running both client and server on Mac. The other day I accidentally locked cursor to client screen (I didn't know what key combo I typed), but since it's a Mac, there is no Scroll Lock key to unlock it, so I ended up having to restart the client.

My question is: what is the default hotkey on Mac that locks the cursor to current screen? I assume it's a toggle. I've searched the Forum/FAQ and found no answer.

Thanks.