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object , name, identity...and newbie

There is an array "thePersons" composed of object : individual1, individual2, individual3,...(class individu obviously !)
each object have properties and a name which the user can define: for example john, mary, george....
I can find the third object of thePersons with his index : 3 it's individual3, his name is george.
But the user can delete (Kill ??!!) one or several objects....
And worse ! the user can change their name.....Mary becomes Elizabeth

To recognize an individualX, I want an index which never change !

Must I make a dictionnary ? or Cocoa can give me a uniqueID ? already made ? (In Hypercard, it's easy, already made ! and I suspect that exists the same in Cocoa, for Hypercard and Cocao must know who makes what with whom...!)

Do I have to create this property? and define it for each individu or can I use an already used property without double use ?

Thanks to be patient ! Hypercard and Cocoa are same family but I am not their grand father ! That's a pity, Cocoa children seems wonderful !
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