How to build a stable, reliable application with consumer and producer

Hi all,
As a frontend solution, Flex is really powerful and fascinate. On the other hand, it inevitiably needs to exchange data. And I am trying to find a good way to build a stable and reliable application.
Here's the workaround. On server side, blazeDS or LCDS is involved and on frontend component Consumer and Producer are used to interact. A group of users cooperates on the whole processing. Everybody will send an update once he finished current job.
Of course each frontend need to subscribe first. But if one frontend is disconnect temporarily and other frontends send message to backend during that time, how can the disconnect one get message it missed? How can I fix the inconsistent status?
Thanks and regards,

Hello meshgraphics,
Your reply is useful, but feasible I have to say. Creating DB tables, updating entries and synchronizing contents involve a lot of work. As we can use blazeDS and LCDS, that'll be good option. From online help, it doesn't explain what will happen if consumer disconnects temporarily which is very important to me. If some messages are missed, the whole process can't move on smoothly.
Simply speaking, I hope below issues can be solved with blazeDS or LCDS:
1) how to ensure messages are delivered to subscribed consumers if they are temporarily disconnected?
2) how to recover work if consumers are thoroughly disconnect?
Thanks and regards,
Felix

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