[CentOS] gdm-simple-greeter, redux

Does *anyone* have a clue where gdm-simple-greeter stores the usernames it
presents? I know that it is not getting it out of /etc/passwd. based on
users who can log in, since I have several machines where one user, who's
rolled off, is still showing, even though /etc/passwd has him as having a
shell that doesn't exist.

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