Set/Get the DOS break flag.
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 Syntax

        GT_Break([<lNewSetting>]) --> lOldSetting

 Arguments:

      <lNewSetting> is an optional logical parameter. If true (.T.)
      the DOS break flag will be turned on, if false (.F.) it will be
      turned off. If not passed GT_Break() just returns the current
      setting.

 Returns:

      The status of the break flag. If a new setting is passed then
      the previous setting is returned. If a new setting is not
      passed then the current setting is returned.

 Description:

      GT_Break() can be used to set and get the status of the DOS break
      flag.

 Examples:

      // Set the DOS break flag on.

      GT_Break(TRUE)

      // Display the current DOS break flag setting.

      ? GT_Break()

 Source: BREAK.C

 Author:  Dave Pearson