INT 21 U - Novell NetWare - "AttachHandle"
        AH = B4h
        DS:SI -> input buffer (see below)
Return: AX = handle or return code
Note:   this is an interface provided by NetWare to give DOS file access to
          NetWare files on non-DOS systems such as Macintosh, OS/2, and Unix

Format of input buffer:
Offset  Size    Description
 00h    BYTE    "WorkFileServer"
 01h    BYTE    access code
 02h    DWORD   "OpenHandle"
 06h    WORD    "OpenHandleCount"
 08h    DWORD   "OpenFileSize"

.