I started a simple diagram to learn to register users.
I added an anonymous user to ACME (unregistered.user), published ACME with unregistered.user as default user and configure him as anonymous user on Configure>Authentication.
In the pool, i put "unregistered" as initiator actor, and maped him as "unregistered.user".
The lane only has the start event, a service task to send mail (connector doesn't use variables at the moment, just send mail from A to B. Test works) and the end event.
I created BDM, contracts and form for pool too.