Data sets are different from every other extension mechanism in DevTest in that they are inherently remote server objects. Consider a load test that has thousands of virtual users all trying to access the same spreadsheet file. DevTest must create a single object that is serving the spreadsheet for all those virtual users to read.
DevTest provides the infrastructure for remoting your custom data set automatically. There are typically no specific issues that are related to this unique characteristic other than the following: Because they are shared, they have no access to an individual test case or test execution state. This means that you do not have access to a TestCase or TestExec object. Your class is run in the address space of the coordinator that is staging the test, not necessarily the simulator that is communicating with the system under test.
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