1. A method for testing a device under test (DUT) by subjecting the DUT to a succession of stimulus signals and by validating that acceptable response signals were returned from the DUT, the method comprising: (a) logically assigning unique identifications to respective ones of the stimulus signals in said succession of stimulus signals to which the DUT is subjected; (b) logically associating returned ones of response signals returned from the DUT with corresponding ones of the unique identifications assigned to respective stimulus signals of the respectively returned response signals; and (c) using the unique identifications to access the returned ones of the response signals when validating the returned response signals.