Hi all: Answering simple questions is a fairly difficult job and thats why A. many may say 'google search' it. B. some may say 'go to such and such' site C. few may say 'here is the answer in brief'
Please see try to read the question to understand what the question means and see if you can provide your insight "if any" on that subject. I'll request the moderators to delete all the replies that fall in the category (A). thanks Saifi.
