In theory, each time you paid for a tuner's time. That tuner will have a cable that can both datalog and manipulate ROM files. The cable you have, however, is only capable of datalogging (which is not a useless power -- see below) and flashing ROMs to your ECU.
You can record datalogs of specific parameters under different driving conditions and send the logs to a tuners for an "e-tuned" ROM. Then you could flash that newly tuned ROM to your ECU.
Datalogging (if you know how to read the logs) is also very useful for troubleshooting problems. You can use the cable for reading and clearing CEL codes too.
Unless you know how to tune a car and are at least somewhat familiar with the Uprev software, you don't really need a tuner cable.
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Enjoy it. Destroy it.
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