US Patent 7716086 Electronic retail order communication

Multiple users are provided the ability to add or modify items in an open order created by an originating user on an electronic retail system. The originating user has the ability to verify and authorize a final purchase order that is submitted to the retail system. The originating user forwards an open order to other users, who are then allowed to add to the order, such as by adding items to a shopping cart. In a tandem browsing mode, other users are invited to observe the interaction of the originating user with an electronic retail system and modify an order for approval by the originating user.