This space for free for your conference.
A registered account is comprised of an email address (formerly, a username) and a password.
A registered account is required to recieve Daily Email Digests and Instant Email Notices. It is also a prerequisite for obtaining a credential.
If you already receive Daily Email Digests, Instant Email Notices, or can post ATels, then you already have a registered account. If you have forgotten your password, you can recover it here.