How do I programmatically set default role for new users?

I would like new users of the blog to have custom role, rather then Subscriber. How do I set this programmatically? I know that it can be changed from[...]

How to change the default registration email ? (plugin and/or non-plugin)

After a new user registration, WP sends out an email with the login / password, and a link to the login page. Is there a way to change this defaut email[...]