anchor.diff:    :m-button
     :x-button1
     :x-button2
  -  :backspace
  +  (:backspace 8)
     :tab
  -  :clear
  +  (:clear #x0c)
     :return
  -  (:shift 16)
  -  (:control 17)
  +  (:shift #x10)
  +  :control
     :menu
     :pause
  -  :capital
  -  (:kana #x15)
  +  :capital ;; capslock
  +  (:kana #x15) ;; also hanguel/hangul
     (:junja #x17)
     (:final #x18)
  -  (:hanja #x19)
  +  (:hanja #x19) ;; also kanji
     (:escape #x1B)
     (:convert #x1C)
     (:no-convert #x1D)
  
positive.code:   :maunch-media-select
    :launch-app1
    :launch-app2
    :oem1
    :oem-plus
    :oem-comma
    :oem-minus
  
negative.code:   (:select 41)
    (:print 42)
    (:execute 43)
    (:snapshot 44) ;; printscreen
    (:insert 45)
    (:delete 46)
    (:help 47)
  