Library /sys$common/syshlp/sysgen.hlb SHARE, /INITIALIZE, Qualifiers, /MAXCEFCLUSTERS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /MAXCEFCLUSTERS=max-cef

    Specifies the maximum number of common event flag clusters
    that the processor can create in the multiport memory unit. The
    default is no limit.