kbtrans_processkey
void kbtrans_processkey(struct kbtrans_lower *, struct keyboard_callback *,
kbtrans_processkey(&upper->kbtrans_lower,
kbtrans_processkey(lower,
kbtrans_processkey(lower,
kbtrans_processkey(lower,
kbtrans_processkey(lower, upper->kbtrans_streams_callback, key, state);