Int 2Fh / B704h         Get APPEND.EXE Directory List Address        DOS 4.0+

    Returns a 32-bit address of a list of the currently appended
    directories.

        Entry   AX = 0B704h

        Return  ES:DI = Pointer to directory list

    The directory list is a zero-terminated ASCII string consisting of
    one or more directory paths separated by semicolons.