INT 21 - Novell NetWare v3+ - CLEAR CONNECTION NUMBER (LOGOUT STATION)
        AX = F217h subfn D2h
        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
        reply buffer filled

Format of request buffer:
Offset  Size    Description
 00h    WORD    0002h (length of following data)
 02h    BYTE    D2h (subfunction "Clear Connection Number")
 03h    BYTE    connection number

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