INT 21 - Novell NetWare - DIRECTORY SERVICES - RESTORE DIRECTORY HANDLE
        AH = E2h subfn 18h
        DS:SI -> request buffer (see below)
        ES:DI -> reply buffer (see below)
Return: AL = status
            00h successful
            else network error code
Desc:   restore a previously saved directory handle to reproduce an executing
          environment, possibly on a different execution site
Note:   this function is supported by Advanced NetWare 2.0+ and Alloy NTNX
SeeAlso: AH=E2h/SF=17h

Format of request buffer:
Offset  Size    Description
 00h    WORD    0011h (length of following data)
 02h    BYTE    18h (subfunction "Restore Directory Handle")
 03h 16 BYTEs   save buffer

Format of reply buffer:
Offset  Size    Description
 00h    WORD    (call) 0002h (length of following results buffer)
 02h    BYTE    new directory handle
 03h    BYTE    effective rights (see AH=E2h/SF=03h)