How XPCOM different from COM?

[Koti]

1. Conceptually what is the difference between COM & XPCOM?
2. where can i get more info about this XPCOM? or where can i ge
doocumentation about XPCOM?

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Thanks In advance,
Koteswara Rao.
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When one door of happiness closes, another opens; but often we look so long
at the closed door
that we do not see the one, which has opened for us. - Hellen Keller.