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

       /SHRFILLM=value

    Specifies the maximum number of shared files that the user can
    have open at one time. By default, the system assigns a value of
    0, which represents an infinite number.