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Answer Posted / kondapallysantoshkumar
every COM object supports atleast one interfaceie IUNKNOWN
interface.each interface supports method acess data and
perform operations transperantely to the programmer,example
iunknown supports 3 methods addref(),release
(),queryinterface().if p is apointer to any iunknow.p-
>addref()increments the reference count
2)release().p->deleting the obkects when the reference
count reaches zero.,
3)queryinterface(idesired,pdesired).p->checks to see if the
current interface supports another interface
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