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@Kas Ob. I agree on splitting the devices into separate units, but for sake of the example to a minimum, I didn't show that. Ref 1) - Master in TBaseController is in principle the core factory, but could be separate. Ref 4) - Multiple interfaces is defintively an option. A capability discovery mechanism is a good idea. The main point of my example was to show a method for avoiding passing unsafe pointers to methods. That said, passing objects is only safe as long as you are in full control of the lifespan of, and access to, said objects. Using class types (TMyClassType = class of TMyType) and encapsulation is a good way of handling polymorphic instantiation in a reasonably tidy way. Using libs like f.x. Primož Gabrijelčič's OmniThreadLibrary really helps solving common threading challenges. Gotta love thread safe queues.

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