Conversations are always bidirectional so when the service receive a message on a conversation, sending a message using the received message's conversation handle will always return the message to the initiator's queue. A console should be able to send a question to a service and receive the response on the FROM SERVICE queue specified in the begin dialog.  This should work whether the service is running or not - that's the beauty of reliable messaging.  It's perfectly legitimate to send a message to a service that doesn't exist.  Service broker assumes that you know what you're doing and that someday the service will exist and at that time the message will be delivered.

 Hi.
 Thanks for your time and help.

 I have a switch problem I am trying to resolve using Service Broker.

 I have any number of consoles that need to ask any number of services any number of questions.

 ------------            -------------
 | Console A |            | Service X |
 ------------            -------------

 ------------            -------------
 | Console B |            | Service Y |
 ------------            -------------

 ------------
 | Console C |
 ------------

 So if Console A asks Service Y a question, Service Y needs to know how to answer console A and not others.

 I thought of starting never ending conversations from Console endpoint to Service endpoint. Each time a service starts, new conversation would begin and it would be ended if service is stopped.
 This will give me a reliable way for any console to pick a service and ask a qestion.

 --------------------------------------------------------
 |         Console Queue/Service                        |
 --------------------------------------------------------
     |                    |
     | Service X          | Service Y (conversations)
     |                    |
 --------------------------------------------------------
 |         Service Queue/Service                        |
 --------------------------------------------------------

 Now, the return path is a bit unclear. Any ideas how I can return answers?

 Thanks
 Farmer.