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I need a modification to the create account script that will initially show only two text fields.. firstname and lastname. The new user will enter these and click 'continue', which will start the usual registration form, and fill in the username automatically with 'firstname.lastname' -- it would be best if the username field was set to readonly, so the new user couldn't change the generated username.
It is also necessary that the initial two text fields would set the appropriate fields in the profile page, and not appear for registered users.
It would be best if this could be done via themes or modules, and not to core files, so updates would not affect the function.