Fundamentally, a username and password are parts of the same thing - a collection of information (often a string of text) that you need to get access to somethi

Fundamentally, a username and password are parts of the same thing - a collection of information (often a string of text) that you need to get access to something. The 'username' is usually just the part of that isn't necessarily hidden. Part of the problem is that Apple's iOS has no username, just a password. Thus, one of the differences with a fingerprint 'password' that I haven't seen much discussed is that it would make him harder to share that tablet with his wife, since they can share one four-digit passcode, but not (as far as I know) two different fingerprints. The fingerprint makes it much harder for the popular family use cases between letting one person in and letting everyone in. Edit: OK, cool, my comment is invalid.