Besides what the other said a very basic comment.

The location where an object is defined (i.e. within a TThread enabled unit) or who created it (the main line code or the thread code) does not matter. The Concept of classes, objects and instances is a matter of memory allocation and pointers and not a concept of program flow. same is absolutely independent. You can use one instance of a class in one thread and another one in another thread. You can create an instance in one thread and call its procedures and properties by another one. (BTW this results in the fact that its very hard to define something like "Thread-safe" for a class).

In fact you need to look exactly how the program flow of each thread is before deciding what code needs to be protected regarding mutual accesses by threads. Just looking at the objects does not help much, Looking at the point where an object is created does not help at all.

-Michael

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