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

    The /KEY qualifier lets you reclaim index buckets for specified
    keys.

    Format

      /KEY=key_number[,...]  filename

    If you request statistics and specify the /KEY qualifier, the
    utility reports the statistics for each key separately. If you do
    not use the /KEY qualifier, the default is to reclaim all index
    buckets and to provide a single report.