How do I know if a CORBA object's destroyed?

[Raga]

Hi,

Am a newbie to CORBA. What happens when a CORBA object is destroyed? I
heard that its ORB reference becomes invalid? If this' true, what
exactly is meant by 'invalid'? What if I try to refer the object after
it is destroyed? And also how do I come to know if the object is
destroyed?


Thanks.