Is AMQP suitable as both an intra and inter-machine software bus?

AMQP is not an RPC framework. It provides the building blocks to model things like shared queues, RPC, pubsub etc. but it does not mandate any specific way to use it.

AMQP is a specification so you'd be comparing apples with oranges really. There are not that many production ready AMQP providers out there really; none of the major messaging providers or vendors support AMQP at the time of writing (e.g. IBM, Tibco, Sonic, BEA, Oracle, SwiftMQ, MS, Apache ActiveMQ, openmq from Sun) - so all the available AMQP providers are pretty new.

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