This one came from Paolo Salvatori (a senior PM within the MS Connected Systems Division Team... I know a bit of a mouthful) whom has gotten in touch with his creative side and drawn a picture for all us common folk :) - well done Paolo.

The scenario is - a Request/Response Port is published at the 'front end', goes through BizTalk and the work is done by a backend system that operates via a One-Way Send and BTS gets the response via another One-Way Receive.

The thing I like about Paolo's piece of work is that he shows all the Message Context Properties required to be set by BizTalk for message correlation.
Which makes this a Messaging Only Solution and NO Orchestrations required!!!! (how cool)

Click on the image to enlarge......one day I'll get Silverlight Zoom Composer control running for these.... :)