Int 60 Fn 0C  - FTP Packet Driver 1.10+ - High-perf Func - Asynchronous S  [N]

   AH = 0Ch
   ES:DI -> pointer to IOCB

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

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

Format of IOCB:
Offset Size    Description
 00h   DWORD   pointer to buffer
 04h   WORD    length of buffer
 06h   BYTE    flags
       bit 0: packet driver is finished with IOCB
       bit 1: application requests upcall when driver completes
 07h   DWORD   function address for upcall
 0Bh  4 BYTEs  future gather write
 0Fh   BYTE    ???
 10h  8 BYTEs  private driver workspace

Completion function called with:
   ES:DI -> IOCB passed to INT 60/AH=0Ch