# File lib/ansi/terminal/win32.rb, line 38
    def SetConsoleEcho( console_handle, on )
      mode = GetConsoleMode(console_handle)

      # toggle the console echo bit
      if on
          mode |=  ENABLE_ECHO_INPUT
      else
          mode &= ~ENABLE_ECHO_INPUT
      end

      ok = SetConsoleMode(console_handle, mode)
    end