Library /sys$common/syshlp/helplib.hlb  —  CRTL  Feature Logical Names, DECC$DETACHED_CHILD_PROCESS
    With DECC$DETACHED_CHILD_PROCESS enabled, child processes created
    using vfork and exec are created as detached processes instead of
    subprocesses.

    This feature has only limited support. In some cases the console
    cannot be shared between the parent process and the detached
    process, which can cause exec to fail.
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