Two things I learned about direct bound ports

When you directly bind to the message box, your messages will get picked up by subscribing orchestrations and send ports and then returned (see diagram below which I got from http://www.c-sharpcorner.com/UploadFile/john_charles/Introduction_to_Biztalk_Server09072007152846PM/Introduction_to_Biztalk_Server.aspx). One thing I learned is that if you have two orchestrations subscribing to a message they will both get it. Another thing you might notice from the diagram is that if your orchestration recieves and sends back the same message then it will pick it up again(and again, and again...). This infinite loop is a rather common peril of message box use.