what's object_id in irb?

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Subject	what's object_id in irb?
From	Massimo Donati <mass.donati@gmail.com>
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Hi everyone i'm running this lines of code:

[home/] irb
2.0.0p0 :001 > object_id
 => 70156571578960


I can't really understand what is this object_id referred to since is not called from any object?

Thanks very much!
Massimo

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what's object_id in irb? Massimo Donati <mass.donati@gmail.com> - 2013-03-05 08:30 -0800
  Re: what's object_id in irb? Robert Klemme <shortcutter@googlemail.com> - 2013-03-05 22:35 +0100

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