This is another Sequential Convoy Message processing sample using an Orchestration. This sample uses the Parallel Action Shape to process multiple records at the same time. This could be used to slow down message processing inside Biztalk and process messages in a controlled manner.
This sample should work for BizTalk 2004 and BizTalk 2006.
Get more information from the original blog post on this topic: http://www.biztalkgurus.com/biztalk_server/biztalk_blogs/b/biztalk/archive/2004/10/05/parallel-sequential-convoy-in-biztalk-server-2004.aspx