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VB6 - Resource with object passing to procedures

When you declare a procedure and pass an object to it, e.g. Public Sub MakeVisible(item as Object) item.visible = true end sub How does VB handle the resource? when you call the procedure Call MakeVisible(Button1) Call MakeCisible(Form1) Does it make a copy of the object and pass to the procedure, or does the ByRef default actually just pass a refernce? Its the passing a whole copy of the object that I am worried about if it does do that.

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