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CMS Project doubt

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In video 28, when we create a cms object, inside the constructor we declare:-

global $FP;

$this->FP= &$FP;

the explanation being we can directly access the global $FP object directly and won't have to use a copy

Doubt 1: throughout earlier project we have used copies and never used &(reference) so why was it essential in this case? 

Doubt 2: What is the difference in using a copy ($this->FP=$FP) and an original? Shouldn't they work similarly as in case of $this->FP=$FP, we are still referencing to the same object.

Doubt 3: How to know when to use a the reference object?

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