Using Self Correlation, the Start Orchestration Shape, and Passing Configured Ports it is easy to get messages back into an Orchestration after it has been processed by another process. This sample shows how to Start two different Orchestrations and receive a response message without any Correlation Set to configure.
This sample should work for in BizTalk 2004 and BizTalk 2006.
Get more information from the original blog post on this topic: http://www.biztalkgurus.com/blogs/biztalk/archive/2006/02/28/Working-With-Start-Orchestration-Shapes_2C00_-Self-Correlated-Ports_2C00_-and-Configured-Port-Parameters.aspx