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  Some programmers force the Caps Lock state to be active by setting bit 6
  of byte 0040:0017H. This can confuse or irritate some program users, so we
  don't recommend it. However, this trick works reliably and precedent
  exists for using it. If you do you'll see that the ROM BIOS updates the
  LED indicator on the 84- and 101/102-key keyboards accordingly. This also
  occurs when you update the Num Lock or Scroll Lock states.