What your forum thread wanted to convey? Hi Priyabrata das, Actually I came to see this thread to learn the Google's technique of searching the keywords. But to my disappointment got nothing sort of thing.
Its okay, but at least you gave the most basic idea of how Google indexes its search and that is through keywords and these keywords are nothing but the file name.
But I would like to know, what about the searches we made, in which we don't specify the file format. for example if I search my name "ataul haque" on Google, how Google start searching the same?