How is "mean" in oo_.mean calculated?

Thank you very much, that is helpful!
I think, my question is then more: In another part of the forum you said about moment calculation:

What does “simulate data series based on the perturbation solution” mean exactly?, how much “data series” are simulated?, will I not only receive moments based on this when I ask for more >100 periods? for <100 periods, what do the moments in the dynare output tell me (in contrast to what I described in my first question above)? most of all: where could I see all of this in the dynare matlab codes (to see for myself)?

Also, if I was only interested in how the system reacts to one shock in isolation, would I be able to retrieve moments for such simulation from the dynare output? Would I need to specify a separate model finding a solution with only that shock for every one of my shocks?

Thanks for your help!