For example:
awful.key({"Shift", }, "Left", volwidget.down)
How to find out what to write instead of “Shift” to use “Fn” key?
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I’ve found the solution: the program
xev.If it runs, it doesn’t show a Fn code. Actually it doesn’t have to: X can’t see that key.
Anyhow, it shows you the codes for “hot” keys, like Fn+LeftArrow (for volume down). In my case the name for that is XF86AudioLowerVolume and I can use it as such in configuration files.