When we are talking digital ports, can Any digital port be used for ANY digital application? For instance if the Roomba on the Tutorial is using D0 and D1 and I am already using those ports, may I use ANY port, say D14,D15 to do the same thing? Or, should i switch the roomba to D0 and D1 and use D14 , D15 for the Other app?

Thanks,

Mel