Library /sys$common/syshlp/basichelp.hlb Qualifiers, OVERFLOW  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Tells BASIC to report arithmetic overflow for operations on integer data
  and/or packed decimal data.

  Format

      [NO]OVERFLOW [ { : } ( data-type,... ) ]
                     { = }

      data-type:  { INTEGER }
                  { DECIMAL }