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INT 2F - Multiplex - DOS 3.3+ internal - INSTALLABLE COMMAND - EXECUTE
        AX = AE01h
        DX = FFFFh
        DS:SI -> buffer
Return: buffer at DS:SI filled with a length byte followed by the uppercase
          internal command to execute (if length not 0)
Notes:  this call requests execution of the command which a previous call to
          AX=AE00h indicated was resident
        APPEND hooks this call
        if the buffer is filled with a nonempty string, COMMAND.COM will
          attempt to execute it as an internal command