This image shows a dashed box on the left side. Inside this box is a smaller box labeled Host Application on the far left. This box has an outgoing arrow labeled Internal Delivery Channel (purchase order request in outbound direction) to a box labeled Host Trading Partner, also inside the larger dashed box. The Host Application box also has an incoming arrow labeled Responding Internal Delivery Channel (purchase order acknowledgement in inbound direction) from the Host Trading Partner box. All of this activity is inside the dashed box.

To the right of the dashed box is an Internet cloud. The cloud has two arrows on its left side. One arrow is incoming from the box labeled Host Trading Partner. The other arrow is outgoing to the box labeled Host Trading Partner. On the right side of the cloud are two arrows. One arrow is outgoing to a box labeled Remote Trading Partner. The other arrow is incoming from the box labeled Remote Trading Partner.