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

       /QUOTA=n

    Specifies the maximum number of physical pages that any image
    executing in the process context can request. An image can set
    the working set size for the process by calling the $ADJWSL
    (Adjust Working Set Limit) system service.

    If you specify a quota value that is greater than the authorized
    quota, the working set quota is set to the authorized quota
    value.