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

       /OUTPUT[=filespec]
       /NOOUTPUT

    Specifies that an output file is to be produced and optionally
    names it. If you specify the /OUTPUT qualifier without a file
    specification, or if you omit the qualifier entirely, the output
    file name matches the input file name. The default file type is
    .RNX.

    You can change the name of the output file by supplying a file
    specification for the value filespec.

    The /NOOUTPUT qualifier suppresses the creation of an output
    file. You can use the /NOOUTPUT qualifier to check an input file
    for errors without using system resources to generate an output
    file.