INT 21 - FTPSOFT.DOS v3.1 - GET ???
        AX = 4402h
        BX = file handle for device "FTPSOFT$"
        CX = size of buffer
        DS:DX -> buffer for data (see below)
Return: CF clear if successful
            buffer filled
        CF set on error
            AX = error code (01h,05h,06h,0Dh) (see AH=59h)
Program: FTPSOFT.DOS is a device driver for Protocol Manager support from
           FTP Software, Inc.
SeeAlso: AH=3Fh"PC/TCP",AX=4402h"NDIS"

Format of data:
Offset  Size    Description
 00h    WORD    (call) BA98h (if different, no data returned)
 02h    DWORD   -> NDIS common characteristics table (see AX=4402h"NDIS")
 06h    DWORD   (call) -> new dispatch table (see AX=4402h"NDIS")
 0Ah    DWORD   -> 28-byte buffer for ??? data
 0Eh    DWORD   ???
 12h    DWORD   -> FAR function to reset dispatch jump table to defaults
 16h    BYTE    ???
Note:   the addresses in the new dispatch table are copied into an internal
          jump table which may be reset by calling the function pointed at by
          offset 12h

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