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 an
    VSI-registered recoverable facility.

    Facility numbers 1 through 127 are reserved by VSI; 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 RMS. The number
    0 corresponds to no recoverable facility. Currently, the only
    VSI-defined recoverable facility is 1 (RMS).

    The recoverable facility that you specify is an input parameter
    that is used only to open the file; it does not actually modify
    any file attributes.

 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.