You can of course also implement locking (specifically releasing locks after some time automatically), but that must be done on the OPC UA server and cannot be done in the frontend as network latency, network issues and CPU performance of browsers could potentially cause deadlocks or other issues. You could then provide these as OPC UA methods and call them from the HMI via a UI Action. As mentioned before you'd still have to handle timeouts/disconnects in the browser on the server side for unlocking after inactivity.
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