I don't know about the current systems, have been wireless for more then 4 years now, but the original iMac had non-standard USB usage because Apple wanted the

I don't know about the current systems, have been wireless for more then 4 years now, but the original iMac had non-standard USB usage because Apple wanted the "power" button in the keyboard, while the USB protocol did not support this usage, at least it didn't at the time; I don't know if this has changed since then. http://forums.macrumors.com/showpost.php?p=11022485&postcount=16 http://forums.macrumors.com/showpost.php?p=11022485&post...