Upon installation the module will create a read-only API key for each user in the database. It will add keys for new users as they are added. It will also run on cron to scan the database for any user that does not have a key and create one for such user if found.
The module adds an 'API key' tab to the user page. The tab is viewable only to a user with 'Use API key' permissions or to an administrator. It is not viewable to other users.