Hey,

> 2. for the same session multiple request may be sent and processed on
> different trees

Not exactly. Requests are serialized at the browser already (queued if
necessary).

> 3. these multiple requests may be handled on different threads
>
> What is the locking mechanism principle to avoid to mess up the object
> tree on two different threads that operate for the same session

Every session is protected by a lock, the same one you take using Update
lock.

Regards,
Koen
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