INT 61 - Banyan VINES - ASYNC TERMINAL EMULATION - SET TAB SETTINGS
        AX = 0003h subfn 07h
        DS:BX -> argument block (see below)
Return: AX = status (see AX=0003h/SF=00h)
SeeAlso: AX=0003h/SF=05h,AX=0003h/SF=08h

Format of argument block:
Offset  Size    Description
 00h    BYTE    session ID (00h)
 01h    BYTE    07h (function "set tab settings")
 02h    WORD    pointer to 80-byte buffer in caller's current DS
                  each byte = 00h if no tab, 01h if tab at that position

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