Int 15 Fn BA10  - Hp Omnishare - Pen Driver - Report Pen Control Area Eve  [n]

   AX = BA10h
   BL = event
      00h the pen left control areas
      01h the pen entered the Brightness- area
      02h the pen entered the Brightness+ area
      03h the pen entered the Contrast- area
      04h the pen entered the Contrast+ area

Return: CF clear if successfully processed
   CF set on error (function not supported, ie. not an OmniShare BIOS)

Note:  The pen driver is responsible for detecting when the pen enters and
     leaves control areas of the OmniShare tablet, and notifying the BIOS.
   The BIOS manages the events, including the autorepetition, and sets
     the status LEDs.

See Also: AX=BA20h,AX=BA13h