Not sure if this is a bug, a feature or neither but I found that if you log into the forum as one admin, you can then login to the admicp as a different admin, then logout of the admincp and then continue using the forum as the previous admin without logging back in. It's kind of like you're logged in with two users. Maybe not a big deal, but I'd thought I'd mention because it struck me as odd.
Not confusing at all and a great feature. It means that you can have a completely separate super administrator user account for the ACP. I have that on my forum, meaning if my account (which is just an administrator with the main capabilities) is ever compromised then I still have complete control with my super administrator account.