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Many eLink systems actually exist in a distributed environment, such as a primary head office system, with distributed branch offices, mobile systems connected to the internet and external eCommerce systems.
The eLink write transactions are naturally distributed (except where disabled), meaning that a valid change to a product made in one place will replicate dynamically to the other servers. This change happens as quickly as possible, but may be some time later if for example you are editting products whilst sitting in an aeroplane without network connectivity.
With a time distributed replication system, there is the possibility of overlapping edits to the same record, and the individual data handlers decide which technique is most appropriate for the type of data being handled.