SunOS 5.11 and compatible operating systems also provide the System V inter process communication (IPC) package. System V IPC has effectively been replaced by POSIX IPC, but is maintained to support older applications.
See the ipcrm(1), ipcs(1), Intro(2), msgctl(2), msgget(2), msgrcv(2), msgsnd(2), semget(2), semctl(2), semop(2), shmget(2), shmctl(2), shmop(2), and ftok(3C) man pages for more information about System V IPC.