Library /sys$common/syshlp/uafhelp.hlb ADD, Qualifiers, /WSDEFAULT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /WSDEFAULT=value

    Specifies the default working set limit. This represents the
    initial limit to the number of physical pages the process can
    use. (The user can alter the default quantity up to WSQUOTA with
    the DCL command SET WORKING_SET.) By default, a user has 256
    pages on VAX systems and 2000 pagelets on Alpha systems.

    The value cannot be greater than WSMAX. This quota value replaces
    smaller values of PQL_MWSDEFAULT.