Transmission Cooler

With some aftermarket aluminum radiators like cold case it says transmission cooler. Does this mean there is a built in transmission cooler and you dont have to run an external cooler? I currently have my stock radiator and external cooler and live in Las Vegas, my car gets hot during the summer. Do you still run an external transmission cooler with a cold case radiato or do you skip the external trans cooler? How does this process work?