X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 2f - multiplex - dos 3.3 append

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INT 2F - Multiplex - DOS 3.3 APPEND - HOOK INT 21
        AX = B703h
        ES:DI -> INT 21 handler APPEND should chain to
Return: ES:DI -> APPEND's INT 21 handler
Note:   each invocation of this function toggles a flag which APPEND uses to
          determine whether to chain to the user handler or the original
          INT 21

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