We've had friends who are sometimes multiple and sometimes not; friends who've integrated and then un-integrated and then found themselves fluctuating up and down the spectrum.

Oh, thank you for mentioning this, I always feel so weird about it when I'm in singlet periods (as now) and I didn't know it happened to other people too.

I think midcontinuum must have predated my time on alt.support.dissociation, because I don't remember it, and I think I remember knowing a median system there. But asdis was already pretty well into decline by the time I was on it, newsgroups were very much no longer in vogue.