> 1. Conceptually what is the difference between COM & XPCOM?
Conceptually, they are close enough. Main difference is that XPCOM is 
available on other platforms too, not only windows. Another major 
difference is that XPCOM is not designed as a systemwide engine, but works 
on per process basis. Shortly this means, that if you install NS6 and NS61 
you probably get most of the things twice

> 2. where can i get more info about this XPCOM? or where can i ge
> doocumentation about XPCOM?
http://www.mozilla.org/projects/xpcom/
I think this is a good place to start

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Regards,
Waleri

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