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

       /CEFCLUSTERS=cef

    Specifies the total number of common event flag clusters
    permitted in the multiport memory unit. The cef value is an
    integer with a default of 32.