That is what your host put in? Okay, first off, no, that will not stop search engines from crawling your site. If you want to do that, create a robots.txt file. As for the <LIMIT> part, I'm not exactly sure why that is there . . . It isn't doing any good denying everybody and then allowing everybody. I don't think the order matters a whole lot but I could be wrong on that one so don't quote me on it.

The IndexIgnore is an Apache handler that stops those certain files from being listed in a directory listing. That can be a security problem if you remove it.