Comment by DrScientist

Sure is more complex - but as I said key thing is to define those interfaces in a way that can be networked - you are just passing data not behaviour and the calls could fail to complete.

In terms of timing the call is synchronous and either succeeds or fails - the details like timeouts/ asynch underhood etc are hidden by the proxy - in the end the call succeeds or fails and if you surface that as a synchronous call you hide the underlying complexity from the caller.

A bit like opening a file and writing to it - most platform apis throw exceptions - and your code has to deal with it.