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CRTL, Version-Dependency Tables, V8.4 and Higher
 *Conan The Librarian 

    The following additional functions are available on OpenVMS Alpha
    and Integrity servers Version 8.4 and higher:

    ftok              sem_init
    semctl            sem_open
    semget            sem_post
    semop             sem_timedwait
    sem_close         sem_trywait
    sem_destroy       sem_unlink
    sem_getvalue      sem_wait
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