/sys$common/syshlp/helplib.hlb READ, Qualifiers, /MATCH  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /MATCH=option

    Specifies the key match algorithm to be used when searching for
    matching keys. Specify one of the following options:

    EQ      Selects keys equal to the match value (default).
    GE      Selects keys greater than or equal to the match value.
    GT      Selects keys greater than the specified key.

    If you are reading indexed files and you do not use the /MATCH
    qualifier, the default is /MATCH=EQ.