Hm. Well it's hard to separate. Personally I think that the Ego and the Super-Ego are the two that we utilize in surface-consciousness, and that they sort of compete for this surface consciousness, while they are each fueled below the level of immediate consciousness by their complimentary processes, which tend to manifest as impressions or forces from within the self; they are not "controlled" or "piloted" in the manner of the ego or super-ego, but rather experienced directly in an unfiltered fashion.