Ok, since no one is answearing, the main question, what do i need the usb cable for, thats coming out of my 0411 PCM with Roadrunner in it, i did some web search, and found only one article about moates.net and its roadrunner product, explaining it more or less precise. Here it is: http://www.superchevy.com/how-to/eng...es-roadrunner/

And as i understood the info from it, it is all this way.:
If you have an odb ll programmer, like EFI Live, with it you can flash and change tunes whith your vehicle non working, and than start your car and check the result. If you get roadrunner installed instead of your chip, you will be able to change the tune while car is running, and see the result straight away. But you still need the programmer.