Look at it as two separate brake systems, front and rear. There are two separate pistons in the master cylinder, the only thing tying them together is a spring and brake fluid.
https://static1.pt-content.com/image...erbrake3-1.jpg
Which ever port on the master cylinder is closest to the brake pedal is the system that you bleed first. Starting with the farthest caliper in that end of the system.
So in the case of the DSE setup, the front port is rear brakes and the rear port is front brakes. You would bleed the front brakes first starting with the passenger side caliper. The reason being is that the front piston won't really stroke all the way until the rear piston is bled. It just makes the job go faster, you can certainly do it "wrong" and be successful, I have.