[Lazarus] IUnknown and reference counting

[Xiangrong Fang]

Hi,

I am reading this:

http://wiki.freepascal.org/How_To_Use_Interfaces

And wondering what's the *purpose* of "reference counting"?  While I use
interface before in delphi and java, I didn't notice that I need a UUID for
interface. I had an impression that it has something to do with COM?

So, what is the purpose of this UUID and the method provided by
TInterfacedObject?

Thanks
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