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What does this mean?
It means if an argument was passed to setID, and it was defined (ie not undef), then set the attribute _id to that argument.
The same name on every site (unless it is taken already)
A different name for every site
The same name for sites I don't care about, but different names on sites I do care about
Different names for sites I don't care about, but the same name on sites I do care about
The anonymous account
Someone else's username
Root, after hacking into the site
Results (241 votes),