/sys$common/syshlp/helplib.hlb
CPML, nextafter(), Exceptions
 *Conan The Librarian 

    Exceptional Argument            Routine Behavior

    x = max_float and y =           Overflow
    +infinity
    x = -max_float and y = -        Overflow
    infinity
    x = min_float and y is less     Underflow
    than or equal to 0
    x = -min_float and y is         Underflow
    greater than or equal to 0
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