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LIB$FLT_UNDER

   The Floating-Point Underflow Detection routine enables or
   disables floating-point underflow detection for the calling
   routine activation. The previous setting is returned as a
   function value.

   This routine is available on OpenVMS Alpha and I64 systems in
   translated form and is applicable to translated VAX images only.

   Format

     LIB$FLT_UNDER  new-setting

Additional information available:

Returns         Argument