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  Name:     dosvers() - get DOS version number as an integer
  Usage:    <integer> = dosvers()
  Params:   none
  Returns:  a floating point value equal to the current DOS version

 ---------------------------------- Example ---------------------------------

                 if ( dosvers() < 3.20)
                      ? "This program requires DOS version"
                      ? "3.20 Or higher"
                 endif