hiya Aubley : )
"Is there any way to detect if an avatar is an alt?"
Claims that the means to detect an alt exist are make, but just using common sense proves otherwise if you think about it practically.
The criteria for detecting alts is made by two residents - with a matching computer IP address. Yes, that could in indeed be one person on a computer with two accounts, positive detection of an alt. Or; it could be two roomates or a brother and sister or boyfriend and girlfriend etc etc, both of whom play secondlife who have one computer at home. That is not detecting alts, that's just