[Cloudsurfer]

RoW stands for Rest of World, which means intended for cars outside North America. The RoW software has some differences over the North American version. They are:

Does not monitor the post cat oxygen sensors. This opens up the possibility of running non catted headers without dealing with check engine lights or the mickey mouse hacks to try to avoid them.

Does not require the clutch to be depressed to start the car.

Removes top speed limiter.

Is optimized for better fuel, so may allow slight power gains.

Does not run the secondary air injection pump.

There are probably a few other differences, but these are the notable ones.