My system is not yet co-conscious. I cannot wait to get to that point bc I do feel excitement about all the benefits! I sometimes am co-conscious with my 4-5 yo self & it feels as though she is a little girl who lives in my head. She laughs & giggles & talks to me (& I to her) in thought. She can be out by herself though & anything that happens will be told to me later by whoever witnesses whatever happened.

I've had some dreadful realizations!
Communication is mainly done through journal writing. I, too, read my journal over & over bc I am all the time finding things that I didn't write. The hand writing is clearly different which is something that I always denied away to being hurried, angered or whatever. But it was the content - the absolute knowledge that I would never think that, say that or write that. Still trying to get them to sign their own work but not much cooperation as yet. My T has suggested that I get a composition book for all of my parts & write each of their names on one. (Another T yrs ago had me map out my system of 20 or so & so I bought a book for every one.) In an attempt to facilitate communication, I started writing to the littles & included a picture of where we used to live when with those who hurt us & where we live now along with a map of the US showing the distance between the states. One of my littles wrote me back
There is more & more communication going on that I would call just a passing of thoughts. I know they aren't mine but I can only dicsern if the thoughts are from a particular 5 or 15 yr old, otherwise it's anybody's guess.
Only rarely do I get startled by hearing my name out loud when I know I didn't say it.