Mm yeah, like Addy said, it varies a lot! Even within systems, sometimes. Me and Khar form a median system, so there's an almost constant back-and-forth of information going on, whether it's conscious (i.e. if we're having a conversation) or unconscious (i.e. where one of us just knows something about the other). Whereas Aeolus is entirely separate from that dynamic; if we want him to know something, we need to go and tell him, and vice versa. He could peek up front to see what we're up to in the ~real world~ if he wanted, but doesn't tend to do that. So:
1. If I'm fronting, Khar will always know what I've said and shares all my memories. If Khar's fronting, it... varies quite a lot, because the main reason he started fronting at all was because of my dissociation issues which came about from mental health troubles. Generally I'll still be there watching things in the background, but sometimes I kinda "check out" a bit and can only remember stuff vaguely. But if there's anything I don't remember clearly, Khar will always fill me in on the details so it's not a big deal.
2. I'm not 100% sure, but... not entirely, I don't think, aha. At least as far as we've experimented with it. Like, the one time Khar tried to do some art while he was fronting, I just ended up taking over without either of us really meaning for it to happen. I know some people would class art as a "physical skill", but it's. Not. Really. There's a lot of technical design and planning that goes into it and. I guess Khar just naturally defers to me on that sort of thing. Not that i mind or anything!! like honestly it was cool w me bc i realised i had no idea what i was doin + didn't really have the patience for it anyway lmao.. It's hard to say for other things though since Khar hasn't actually tried all that much. Hmm. Well, when he plays video games he tends to have to ask me for help with some things if he doesn't know how to do it, even if I do know it, but the flow of information in that situation isn't always like a conversation of him asking and me answering, so much as just. Mental brain thought things that don't necessarily involve words. But yeah, short answer is: technical knowledge isn't automatically shared but it's easy enough to pass information between us when needed, or for the one who knows how to do it to take over.
3. Yeah, physical knowledge is all associated with the system autopilot, not any individual one of us. So like. Typing. A lot of typing is just muscle memory, and the autopilot is the one who has all the muscle memory and whatnot, so any of us can type easily (with our individual typing styles more reflecting our thought processes than actual typing skill). Things like movement and basic physical tasks like opening doors are all the autopilot. Even when one of us is fronting, it's more like we're telling the autopilot where to walk or what door to open, haha. Which is probably the same even for non-plural peeps, when you think about it. Like, when you walk, you're not consciously calculating which muscles to move and when you need to do so in order to keep your balance. You just think about walking somewhere and your body does it. Autopilot! But there are some mental quirks we each have when it comes to actually interacting with the ol' autopilot. Khar tends to be more clumsy and uncertain than I am, but also a lot more quick and energetic.