dear praveen,
it's good, that you got the point correctly. the prevous posts are posted by experts or corrected by experts and there will be lot of interaction and the final outcome of any discussion will be authentic.
it's very easy and to get immediate answer readily available at the top by posting a query. but if the person who is answering is one another inquisitive person like you, or a man with half knowledge like me,
then what will your fate be?
and may be you too will answer this question when posted by the next person. digging is difficult,
but if you want diamonds and gold, they are not available on the surface. you have to do mining!
i posted this response in more detail than required with the hope that it will be read by many people in this forum with questions.
all the best in learning and trading.
MurthyMSR