If you've purchased a command control system for your railroad, part of the reason was probably to eliminate the need for electrical blocks and the toggle switches to control them. You can control reverse sections manually, if you choose, but there are many ways to control them automatically. The goal of this piece is to apprise you of every option you have - you choose what is best for you. D.P.D.T. means double pole, double throw.
Double pole means that it has two independent circuits - one for each rail.
More about wiring these later. First, to dispel some mis-thinking of many people. With DCC, the polarity on the track has nothing to do with the direction of a loco. You can reverse the polarity on the rail while a loco is moving, and the loco won't even flinch. So, if you choose to control a reverse section manually, you can simply use a D.P.D.T. toggle switch to control the polarity of the reverse section.