Associates a named common event flag cluster with a process
    to execute the current image and to be assigned a process-
    local cluster number for use with other event flag services.
    If the named cluster does not exist but the process has suitable
    privilege, the service creates the cluster.

    Format

      SYS$ASCEFC  efn ,name ,[prot] ,[perm]

    C Prototype

      int sys$ascefc  (unsigned int efn, void *name, char prot, char

                      perm);