Library /sys$common/syshlp/helplib.hlb  —  CRTL  iswcntrl  Argument
 wc

    An object of type wint_t. The value of wc must be representable
    as a wchar_t in the current locale, or must equal the value
    of the macro WEOF. If it has any other value, the behavior is
    undefined.
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