Spec adds priorities, store and forward, timeouts, queueing or router, possibly several of these. Client and server can be disconnected. Standard form of message. This is type safe, not manually setting up the mapping. DII is not type safe.
Main change is on client side to talk to reply handler that is skeleton for servant.
Client side ORB must be messaging aware. Francis comments that these are like continuations. You can specify policies based on the intermediaries. Apparently, the claim is that transactions do not work over the intermediaries. Priorities across many clients cannot be balanced.