Laptop
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Entities from the server imported to the laptop keep the same URN.
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Entities created on the laptop are allocated a temporary URN by creating a normal URN but replacing the first 0 of the sequence number by T.
For example, GCN/000023 becomes GCN\T00023.
This means a URN created on the laptop can't clash with a URN on the server when its imported to the server.
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When an entity created on a laptop is imported to the server it's allocated a permanent server URN.
When it's next exported to a laptop, the temporary URN of the entity on the laptop is replaced by the permanent URN from the server entity.