Our demonstration layout uses Tortoise slow-motion point motors to operate Peco 00 points, but most point motors can be operated on a DCC layout.
The key is the accessory decoder which sends the control messages to the point motor.
We use the Digitrax DS64 (which can operate four separate points); this device, through the LocoNet bus circuit, receives messages from the computer software, and passes on these commands to the relevant point (which will have been programmed with a unique accessory number).
The point changes direction as required, and the train moves through it using the route the computer selected. Simple!