You can send invites to colleagues or other people that you want to contribute to a tome that you're a member of. If they don't have an account on tomehost already, they will be sent a link that will guide them to set up an account and then map them as a user of the tome. If they already have an account on tomehost then clicking the link in the mail will link their account to the new tome so they'll have full access to it.
