Returns the segment of the passed character string
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 Syntax

        GT_Segment(<str>) --> nSegment

 Arguments:

      <str>     - Character String

 Returns:

      nSegment  - The segment of <str>.

 Description:

      This function will become invaluable when calling GT_Int86()
      functions, as some of these functions will need to know the address
      of strings that are passed in.


 Examples:

      ? GT_Segment(str)


 Source: GT_SEG.C

 Author:  Brian Dukes