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Can I send something to that client using each entity pointer,instead of using the first entity that the client created ? Or should I create an invisible,non-updating entity on the server for every client,and when I have to send something to that client,I should use that certain entity.




The second option is the best. That way, you can create as many updating entities as you want and each client will only have one "address", that of the non-updating entity.

So you will end up using the entity pointer, but only the non-updating one.