Library /sys$common/syshlp/helplib.hlb  —  CRTL  Feature Logical Names, DECC$STREAM_PIPE
    With DECC$STREAM_PIPE enabled, the C RTL pipe function uses the
    more UNIX compatible stream I/O.

    With DECC$STREAM_PIPE disabled, pipe uses the OpenVMS legacy
    record I/O. This is the default.
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