Once objects can be copied from one location to another, the issue to be addressed is object coherency. At Advice level, data coherency and concurrency control can be achieved by using adequate owners. Higher level replica management systems can be used then.
To replicate objects, Advice could follow the steps given in the section above but the last one, i.e. the source object is kept. The target owner will talk to the source DAS, to maintain coherency. In turn, the source DAS will delegate to the local owner. Thus, an owner-owner protocol is implementing the low-level coherency protocol in Advice. Higher level more sophisticated coherence protocols can be implemented above.