A system is all of your alters together. They act like a system. Each one performing a function that was vital to your survival. I believe what T was trying to tell you that as you are triggered an automatic response may be to switch and the alter that can best handle the situation will come out. I guess I am not very good at explaining this but maybe you can understand a bit better.

I have never tried to dissociate on purpose it just happens. I am unaware when it happens as I am not co conscious but I think others here are and can probably relate better to that.

BB