never gonna use it but maybe somebody at interbike can ask. Are the shifters somehow 'coded' to the ders? So, if 2 riders riding close side-by-side, the one shifts and shifts the other's rear der? Since the shifter is closer?
Or TTT, close together and the rear guy shifts and the front guy's der shifts??
Or TTT, close together and the rear guy shifts and the front guy's der shifts??