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может это клавиши быстрого набора:)) смотри это с http://www.freepatentsonline.com/5739507.html
ссылки:
According to principles of this invention, with all keys of a keyboard having a uniform key spacing, each key having a shorter stroke is mounted on a lever having a short key moment arm and a long switch moment arm thereby forming a short-stroke rocker key assembly, and each key having a long stroke is mounted on a lever having a long key moment arm and a short switch moment arm, thereby forming a long-stroke rocker key assembly, wherein, in a mounted condition, a long stroke rocker key assembly lies within with a forked lever of a respective adjacent long stroke rocker key assembly. то есть все таки связано с клавой
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