INT 21 - Novell NetWare v3+ - ADD EXTENDED TRUSTEE TO DIRECTORY OR FILE
        AX = F216h subfn 27h
        CX = length of request buffer in bytes
        DX = length of reply buffer in bytes
        DS:SI -> request buffer (see below)
        ES:DI -> reply buffer (ignored)
Return: AL = status

Format of request buffer:
Offset  Size    Description
 00h    WORD    length of following data
 02h    BYTE    27h (subfunction "Add Extended Trustee to Directory or File")
 03h    BYTE    directory handle
 04h    DWORD   (big-endian) object ID
 08h    WORD    trustee rights (see below)
 0Ah    BYTE    path length
 0Bh  N BYTEs   path name

Bitfields for trustee rights:
 bit 0: read
 bit 1: write
 bit 3: create
 bit 4: delete
 bit 5: access
 bit 6: file
 bit 7: modify
 bit 8: supervisor

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