For other key modes this control is ignored and extended key codes are only controlled by the key group specific setting.
if select format for modifier keys in other key press reports is set to a value other than 0, then the terminal acts as if all bits of this control are set.
flags is not given, reset this setting to it's initial state.
|left, right, up, down, home, end, page up, page down,|
insert, delete (if not configured as DEL),
find, select, left tab (aka shift-tab)
|select, print, execute, undo, redo, menu, find, cancel, help, break|
🛈 defaults to 0.