Why do use webApps userID + password instead of a password only?
Just out of curiosity, I wonder why web apps typically user a userID and a
password.
I don't see reasons, why a sufficiently long password doesn't fit too. For
example, a password generated by a server-application.
Are there reasons an app ultimately has to use a userID too?
As long as password are unique and long, it perfectly allows to identify a
user.
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