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See http://lct.sourceforge.net/lct/x60.html for terminology.
Call enter_keycodes_mode()/exit_keycodes_mode() to switch into and
out of keycodes mode. In keycodes mode, the only events passed to
the application are "press $N" / "release $N" where $N is the
keycode the user pressed or released.
Much of this is cribbed from the source of the "showkeys" utility.
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