[erlang-questions] Hierarchy of gen_server

[Aaron Feng]

Is hierarchy of gen_servers a preferred way to design an erlang
application?  Or this should be avoided and use a more parallel gen_server
relationship?

In either case, what is the best way for gen_servers communicate with each
other?  Should the pid be passed into the gen_server that needs to
communicate the other gen_server, or just use gen_server's registered name?

Aaron
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