Hi,
With the multiple carts setting activated, a user can have several carts.
However, he only has one current cart. He can switch between his carts on his carts listing page.
The current cart is linked to the user entry and its cart_current is set to 1 while the other carts of the user are set to 0.
So, by default that means that all the browsers sharing the same user_id will see the same cart as the current cart.
If you want to allow different browsers logged in with the same user entry to have different current carts, it's technically possible, but it will require the development of a class override:
www.hikashop.com/support/documentation/6...ntation.html#classes
You want to override the file administrator/components/com_hikashop/classes/cart.php and in your override, you want to override the getCurrentCartId method. In it, you can pretty much do whatever you want so you could even return the id of the cart of someone else and it should allow HikaShop to load the cart from the other user as if it was the current user's cart.