Setting Variable Option in the Test
To set the variable option in the test, use the Test Property icon.
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Create a new test or open an existing test.
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Click on the Test Properties icon.
Field or Control Description 
The test properties icon is located in the Test information group box.
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Set the Variable Action field.
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None (default). The test will not use persistent variables. All variables set in the test are only global to the current test run.
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Read. The test can only read persistent variables from existing persistent variables in the PTF test database.
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Write.
The test can only write persistent variables to the PTF test database.
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Read & Write. The test can read and write persistent variables from and to the PTF test database.
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