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Authtoken != userID. Once the user logs in with the authToken, he/she is assigned a userID. You'll find that if you supplied your own unique "squirrelIDs" on the backend when building the authToken (it's one of the parameters for creating one, along with displayName and role), then that user will end up with the userID specified, prepended by the extra string bits Raff mentioned (EXT means "external", and we add your account name for some extra namespacing to ensure everyone has unique userIDs).

nigel