INT 61 - Banyan VINES - ASYNC TERMINAL EMULATION - INTERRUPT ON HOST MESSAGE
        AX = 0003h subfn 14h
        DS:BX -> argument block (see below)
Return: AX = status (see AX=0003h/SF=00h)
SeeAlso: AX=0003h/SF=0Eh

Format of argument block:
Offset  Size    Description
 00h    BYTE    session ID (00h)
 01h    BYTE    14h (function "interrupt on message from host")
 02h    DWORD   pointer to routine to be called (0000h:0000h = don't call)
 06h    DWORD   stack pointer to use when call is made

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