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

       /WORKING_SET=default

    Specifies the number of pages in the working set of the created
    process.

    The default working set size is the size established at system
    generation time. The minimum number of pages required for a
    process to execute is 10 pages. The value specified cannot be
    greater than the quota specified with /MAXIMUM_WORKING_SET.

    The maximum working set quota is nondeductible.