Int 2F Fn 122B  U - DOS 3.3+ Internal - Ioctl                              [D]

   AX = 122Bh
   BP = 44xxh
   SS = DOS DS (must be using a DOS internal stack)
   additional registers as appropriate for INT 21/AX=44xxh

Return: as for INT 21/AH=44h

Notes: equivalent to INT 21/AH=44h, but may only be called when already inside
     a DOS function call
   sets user stack frame pointer to dummy buffer, moves BP to AX, performs
     IOCTL, and restores frame pointer
   used by NLSFUNC in accessing COUNTRY.SYS when invoked by the DOS kernel

See Also: INT 21/AH=44h