I'm using a Logitech K270 wireless keyboard with a M185 mouse.
The keyboard has some hotkeys, some of which work e.g. Volume up, volume down, mute and some which don't work e.g. calculator.
When I use xev I can see that the relevant key is outputting XF86calculator.
Trouble is I haven't been able to trace how to configure Raspbian to open galculator.
Can anyone point me to a resource whcih explains how these keymappings work?