Welcome to the forum, search is your friend by the way, you'll often get an answer wicker by searching than you will by opening a new thread.
I don't quite see what you're trying to stay here. With iOS5 the only way of having multiple pages open is to have them in tabs...
Are you referring to what we had prior to the ios 5 update? If so, Mr. Luke is correct with the way ios5 created tabs to open multiple windows versus closing down one page to revert to a previous one. I sort of found that a bit annoying and like the tab system. To me, it is consistent with how I view and surf online using my PC. Hope this clarified your question. Good luck.