INT 21 - Novell NetWare - DIRECTORY SERVICES - SAVE DIRECTORY HANDLE
        AH = E2h subfn 17h
        DS:SI -> request buffer (see below)
        ES:DI -> reply buffer (see below)
Return: AL = status
            00h successful
            else network error code
Note:   this function is supported by Advanced NetWare 2.0+ and Alloy NTNX
SeeAlso: AH=E2h/SF=12h,AH=E2h/SF=17h

Format of request buffer:
Offset  Size    Description
 00h    WORD    0002h (length of following data)
 02h    BYTE    18h (subfunction "Restore Directory Handle")
 03h    BYTE    directory handle

Format of reply buffer:
Offset  Size    Description
 00h    WORD    (call) 0010h (length of following results buffer)
 02h 16 BYTEs   save buffer

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