[erlang-questions] beginner: passing messages between supervisor trees

[Pinku Surana]

I'm still new to the idea of supervisors in Erlang. Assume I have a client C managed by supervisor MC, and server S managed by supervisor MS. When C sends a message to S, does the message get routed through MC and MS first? Or do C and S communicate directly? If so, where in the code are they connected together? 
 
If C sends a message to S and S fails, will C's message be saved somewhere so it can try again after restarting S? Is this done automatically, or manually by one of the supervisors? 
 
If S fails repeatedly, then I want to replace it with S2 (a simpler task). How can C's messages be routed to S2 transparently? I don't want C to be aware of the failures.
 
I hope that made sense. Thanks.
 
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