I don't understand integration yet either! All I know is that it takes a TON of energy to keep my mind in the here and now. My mind wants to split off. But I am staying here and that makes me feel all the parts of me just being me when things are going on. In the an alter would be angry about something and I was just watching from outside (or not even there). Now I feel the anger and feel my brain want to shift over to the alter who knew anger, but I stay with the emotion instead and I experience it fully rather than leave the scene or watch myself experience it.