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

 ru-facility

    Specifies the number or name of a recoverable facility. It can
    be an integer from 0 through 255, or it can be the name of a
    Compaq-registered recoverable facility.

    Facility numbers 1 through 127 are reserved by Compaq;
    facility numbers 128 through 255 are available for user-written
    recoverable facilities. RMS is recoverable facility 1; specifying
    the number 1 is equivalent to using the text * corresponds to
    no recoverable facility and is equivalent to using the qualifier
    /NORU_ACTIVE. Currently, the only Compaq-defined recoverable
    facility is 1 (RMS).

 data-filespec[,...]

    Specifies the file that is 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. The file specification cannot include a node name, since
    the SET FILE command is not valid for network access.