Int 60 Fn 0B  - FTP Packet Driver 1.09 - High-perf Func - Asynchronous Se  [N]

   AH = 0Bh
   DS:SI -> buffer
   CX = length of buffer
   ES:DI -> FAR function to call when buffer becomes available

Return: CF set on error
       DH = error code (0Bh,0Ch) (see AX=01FFh)
   CF clear if successful

Notes: unlike function 04h, the buffer is not available for modification as
     soon as the call returns; the buffer may be queued by the driver and
     not processed until later
   this function has been dropped from v1.10+ of the specification and
     replaced by function 0Ch

See Also: AH=04h"Packet Driver",AH=0Ch"Packet Driver"

Completion function called with:
   AX = result
       00h copy OK
       nonzero error
   ES:DI -> buffer passed to INT 60/AH=0Bh call