<p>Specify the format that the password field is using. MD5 hashing is useful for connecting to other common web applications like PostNuke.</p> <p>Use 'internal' if you want the external database to manage usernames and email addresses, but Moodle to manage passwords. If you use 'internal', you <i>must</i> provide a populated email address field in the external database, and you must execute both admin/cron.php and auth/db/cli/sync_users.php regularly. Moodle will send an email to new users with a temporary password.</p>