INT 14 - TelAPI - BUFFERED WRITE
        AH = E3h
        BX = connection ID
        CX = length of buffer in bytes
        ES:SI -> buffer containing data
Return: AX = number of characters actually written??? (negative on error)
SeeAlso: AH=07h"TelAPI",AH=E6h,AX=FF00h,INT 6B/AH=00h

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