A person, who physically possesses a VK, can request to VK.
Same VK can be used by anyone in the family or friends. VK will follow the person who has touched it last.
VK will follow every request of the person who has touched it last even when it is not with them. For example, if you keep your VK in your wardrobe or on a table, you can still request it when you are away from it because VK is connected to the person who has touched it last.