Library /sys$common/syshlp/helplib.hlb  —  CRTL  vfwprintf  Description
    The vfwprintf function is equivalent to the fwprintf function,
    with the variable argument list replaced by the ap argument.
    Initialize ap with the va_start macro (and possibly with
    subsequent va_arg calls) from <stdarg.h>.

    If the stream pointed to by stream has no orientation, vfwprintf
    makes the stream wide-oriented.

    See also fwprintf.
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