[1.7] Keep customer logged in between shops with different carts

[Sekka]

Hello o/

I'd like to know if it is possible to keep the client logged in between two shops of the same domain ? i.e :

mydomain/shop1

mydomain/shop2

I found several tips for previous Prestashop versions and kinda succeded in keeping the customer logged in but it shares the cart as well and this is not what I want.

Any tips to keep distinct carts between shops while maintaining the client logged in when he switches shops ?

Thank you