Int 15 Fn BA12  - Hp Omnishare - Pen Driver - Store Pen Battery Charge     [n]

   AX = BA12h
   BL = new battery state (00h good, 01h low charge)

Return: CF set on error
   CF clear if successfully stored in CMOS

Note:  The last report will be displayed by the Power-On Self Test the next
     time the OmniShare boots.  This allows something meaningful to be
     reported even if the pen is not detected during the POST.

See Also: AX=BA13h