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

 filespec[,...]

    Specifies one or more files to be modified. If you specify more
    than one file, separate the file specifications with commas (,).
    The asterisk (*)  and the percent sign (%) wildcard characters
    are allowed.