Replicating COM+ Server

What i need to do is have another server in another office thats replicates my COM+ application. This is fine i can just export the application from one server to the other. But what do i do with the proxy?

How do i tell my proxy to look at the backup server if the main server goes down? Do i need need to have load balancing set up?

Is it a a case of updating the client machines with a proxy from the backup server (I hope not). My SQL Server is replicated to the backup server and the Contruct string is pointing to the right databases on both COM+ applications but im unsure how to direct my client proxy to the new server. How does the proxy know which server to look at?

Any help would be appreciated.

Thanks