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CRTL, Feature Logical Names, DECC$USE_JPI$_CREATOR
 *Conan The Librarian 

    When enabled, DECC$USE_JPI$_CREATOR determines the parent process
    ID in getppid by calling $GETJPI using item JPI$_CREATOR instead
    of JPI$_OWNER.

    This feature is only available on systems supporting POSIX style
    session identifiers.
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