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

 data-filespec[,...]

    Identifies the file to be marked for after-image journaling. If
    you specify more than one file, separate the file specifications
    with commas. The asterisk (*)  and the percent sign (%) wildcard
    characters are allowed. The file specification cannot include a
    node name, since the SET FILE command is not valid for network
    access.