Google ask your preferred domain in webmaster. Preferred domain is one which you like to appear on search result page. Google will try to index your site according to preferred domain of your choice. So, web site satya-weblog.com can appear as http://satya-weblog.com or http://www.satya-weblog.com. I have set my preferred domain as http://www.satya-weblog.com.
Once you set your preferred domain, you should redirect 301 (permanent redirect), to tell Google and other search engine what you prefer. This will result in better credit of search ranking to your pages.
In the image "Geographic target=Unlisted" tells the Google that my site is not targeted for geographic location. It is global and for all.
Crawl rate setting may be different for you. Set custom crawl rate option appear only for good traffic site.