It depends on the character in question. Some might restrict their muse wholly to only their own EgoID, some might restrict only to alpha forks of themselves, some might restrict to alphas and betas. Something occurs to me: people might set it up so the muse will answer any non-incriminating question posed to it by anyone, some might be set up to only answer others' questions if their own directly okays it, either on a case-by-case basis or by whitelist. IE, you (or more likely, your muse,) asking your buddy's muse what kind of a mood he's in so you know if it's a good time to challenge him to a game of VR Football or not. His muse might pass the question on to him, it might have you on an okay list, or it might just answer questions like that in general. Likewise, people might set up their muses to allow varying degrees of cooperation with their forks; IE, Betas get access to non-incriminating information, Alphas get access to non-supersecret stuff, but only the original gets access to supersecret stuff that happened since the ego's backup was taken. Of course, I should point out that muses [i]are[/i] simply software AIs - complicated, yes, but not so complicated they are beyond electronic attack.