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A further option would be to write and read the data to a database or MS Excel spreadsheet via the DBTester functions. Please view the associated help files on these topics for an actual example.
For distributed testing, the file that contains these variables, must be accessible to those target machines that are associated with distributed test. To ensure this one would add the UNC path to the actual directory where the file is located. (\\\ \data.txt) Therefore you are specifying where this file is located on your network.
Another option would be to add the data file on the same directory on each distributed machine, but obviously the former option would be much more efficient.