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INT 2F - Multiplex - DOS 4.0 APPEND - SET RETURN FOUND NAME STATE
        AX = B711h
Note:   if the next INT 21h call (and ONLY the next) is function 3Dh, 43h, or
        6Ch, the fully qualified filename is written over top of the filename
        passed to the INT 21h call.  The application must provide a
        sufficiently large buffer.  This state is reset after next INT 21h
        call processed by APPEND.