>If u have msdn then html help file called ieref.chm gives detailed explanation..
>
>I'm not sure whether this file is avl from internet or not..
>

Even if it's not downloadable, the information is available through MSDN OnLine (msdn.microsoft.com/developer); it's probably a part of the IE Resource Kit. I'm not sure if that's a free download ort something you have to order from MS on CD if you don't get the MSDN.