VMS Help CONVERT, file, Qualifiers, /SHARE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Specifies whether the input file is to be opened for sharing with
    other processes during the conversion.

    Format

      /SHARE

      /NOSHARE  (DEFAULT)

    You can use the /SHARE option to generate a rough backup of a
    file that is always opened for sharing by some applications.
    However, another process can alter the records during the Convert
    utility operations. As a result, the consistency of the output
    file cannot be guaranteed.