VMS Help RUN, Process, Qualifiers, /OUTPUT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /OUTPUT=filespec

    Defines an equivalence name string of 1 to 63 characters for the
    logical device name SYS$OUTPUT. Both the equivalence name and the
    logical name are placed in the process logical name table for the
    created process.