From DAT One, the broker can click on Private Network where all their contacts will be listed.  The pad lock indicates the carrier will view their private loads from DAT One.  The circle indicates the carrier can view the loads from a DAT product (like DAT One Mobile, TruckersEdge, DAT Power, etc).

Non-DAT customers will receive an email notification for the shipment.  They can click the link within to create a free account to view the shipment.