It was a Girls Traveller thing as recall, you might want to check,ask on the SJG's traveller forum.

On January 19, 2021, at 18:14, "gndonald2001 at yahoo.com.au (via tml list)" <xxxxxx@simplelists.com> wrote:

Back in 2004 someone wrote a program to generate sector specific TNS entries. As far as I can tell it was MS Windows only. I've not been able to locate any surviving copies. The basic idea sounds like some thing that would be very useful so I am wondering if anyone still has a copy?
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