Key Groups
XKB allows for the keyboard to switch between any of four different character groups. This is usually done for making a keyboard behave like a keyboard of a different language. In this context, the set of characters that is generated by the keyboard is called a group, and a keyboard can switch to a different group at any time.
XKB defines some group selectors (which are simply called groups in the specification). As with modifiers, a group selector can be associated with a key, but can also be latched or locked.
Read more about this topic: X Keyboard Extension
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