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I was doing this with COM twenty years ago. It had the same advantages of modularity and language independence but without the unnecessary headaches of a distributed system.

I take your point, but it saddens me that there aren't better ways of achieving this modularity nowadays.

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I was too, of course a distributed system could also be built with DCOM and MTC (later COM+), and the DTC (Distributed Transaction Coordinator) could be used when you needed a transaction across services (or DBs, or MQs). Obviously the DTC was developed in recognition of the fact that distributed transactional service calls were a real requirement - something that current microservice architectures over HTTP REST don't seem to support.

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