Sharing customers in multistore

[cprats]

Hello, I have a question:

I have a store in www.example.com. I want to make a second TB install in www.subdomain.example.com and I want to enable multistore in www.example.com. Can I share customers between www.example.com and www.subdomain.example.com? Is there a way to have all users who have already signed up in www.example.com shared with www.subdomain.example.com? If a new user signs up in any of both stores, will his account be created in the other one?

I've never worked with multistore before and I wasn't able to find answers to these questions in TB documentation.

[wakabayashi]

Its possible to set it up like this. We haven't done it, since back then prestashop didn't recommend to share customers across shops.