I was following this question to do some remapping. In the question, there is:
Additional information: The sequence of these mappings is Key, Shift+Key, mode_switch+Key, mode_switch+Shift+Key, AltGr+Key, AltGr+Shift+Key.
I looked at the modifier keys in Xmodmap in order to understand which modifier key is the mode_switch key but did not see any. Then I realized that mode_switch is not a modifier key but it is actually a keysym, along with the Shift and AltGr.
So my question is, is there any combination that makes use of, say Mod5? What is the purpose of these modifier keys?
