It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

Is there an way to check what key does what?
I'm specifically looking for a way to quickly switch between secondaries and devices, but while I'm at it I'd like to remind my self whole keyboard layout.
Found it:
Options >> Controls >> Keyboard + mouse >> Customize Controls