Library /sys$common/syshlp/helplib.hlb  —  CRTL  vwprintf  Description
    The vwprintf function is equivalent to the wprintf 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. The vwprintf function does not invoke
    the va_end macro.

    See also wprintf.
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